The sample demonstrates how to sign PDF document with digital certificate.

Download DigitalSignature.pdf

using System;
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Security;

namespace DigitalSignature
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a pdf document.
            PdfNewDocument doc = new PdfNewDocument();

            // Create one page
            PdfPageBase page = doc.Pages.Add();

            //Draw the page
            DrawPage(page);

            String pfxPath = @"Demo.pfx";
            PdfCertificate cert = new PdfCertificate(pfxPath, "e-iceblue");
            PdfSignature signature = new PdfSignature(doc, page, cert, "demo");
            signature.ContactInfo = "Harry Hu";
            signature.Certificated = true;
            signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill;

            //Save pdf file.
            doc.Save("DigitalSignature.pdf");
            doc.Close();

            //Launching the Pdf file.
            System.Diagnostics.Process.Start("DigitalSignature.pdf");
        }

        private static void DrawPage(PdfPageBase page)
        {
            float pageWidth = page.Canvas.ClientSize.Width;
            float y = 0;

            //page header
            PdfPen pen1 = new PdfPen(Color.LightGray, 1f);
            PdfBrush brush1 = new PdfSolidBrush(Color.LightGray);
            PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Arial", 8f, FontStyle.Italic));
            PdfStringFormat format1 = new PdfStringFormat(PdfTextAlignment.Right);
            String text = "Demo of Spire.Pdf";
            page.Canvas.DrawString(text, font1, brush1, pageWidth, y, format1);
            SizeF size = font1.MeasureString(text, format1);
            y = y + size.Height + 1;
            page.Canvas.DrawLine(pen1, 0, y, pageWidth, y);

            //title
            y = y + 5;
            PdfBrush brush2 = new PdfSolidBrush(Color.Black);
            PdfTrueTypeFont font2 = new PdfTrueTypeFont(new Font("Arial", 16f, FontStyle.Bold));
            PdfStringFormat format2 = new PdfStringFormat(PdfTextAlignment.Center);
            format2.CharacterSpacing = 1f;
            text = "Summary of Science";
            page.Canvas.DrawString(text, font2, brush2, pageWidth / 2, y, format2);
            size = font2.MeasureString(text, format2);
            y = y + size.Height + 6;

            //icon
            PdfImage image = PdfImage.FromFile(@"Wikipedia_Science.png");
            page.Canvas.DrawImage(image, new PointF(pageWidth - image.PhysicalDimension.Width, y));
            float imageLeftSpace = pageWidth - image.PhysicalDimension.Width - 2;
            float imageBottom = image.PhysicalDimension.Height + y;

            //refenrence content
            PdfTrueTypeFont font3 = new PdfTrueTypeFont(new Font("Arial", 9f));
            PdfStringFormat format3 = new PdfStringFormat();
            format3.ParagraphIndent = font3.Size * 2;
            format3.MeasureTrailingSpaces = true;
            format3.LineSpacing = font3.Size * 1.5f;
            String text1 = "(All text and picture from ";
            String text2 = "Wikipedia";
            String text3 = ", the free encyclopedia)";
            page.Canvas.DrawString(text1, font3, brush2, 0, y, format3);

            size = font3.MeasureString(text1, format3);
            float x1 = size.Width;
            format3.ParagraphIndent = 0;
            PdfTrueTypeFont font4 = new PdfTrueTypeFont(new Font("Arial", 9f, FontStyle.Underline));
            PdfBrush brush3 = PdfBrushes.Blue;
            page.Canvas.DrawString(text2, font4, brush3, x1, y, format3);
            size = font4.MeasureString(text2, format3);
            x1 = x1 + size.Width;

            page.Canvas.DrawString(text3, font3, brush2, x1, y, format3);
            y = y + size.Height;

            //content
            PdfStringFormat format4 = new PdfStringFormat();
            text = System.IO.File.ReadAllText(@"Summary_of_Science.txt");
            PdfTrueTypeFont font5 = new PdfTrueTypeFont(new Font("Arial", 10f));
            format4.LineSpacing = font5.Size * 1.5f;
            PdfStringLayouter textLayouter = new PdfStringLayouter();
            float imageLeftBlockHeight = imageBottom - y;
            PdfStringLayoutResult result
                = textLayouter.Layout(text, font5, format4, new SizeF(imageLeftSpace, imageLeftBlockHeight));
            if (result.ActualSize.Height < imageBottom - y)
            {
                imageLeftBlockHeight = imageLeftBlockHeight + result.LineHeight;
                result = textLayouter.Layout(text, font5, format4, new SizeF(imageLeftSpace, imageLeftBlockHeight));
            }
            foreach (LineInfo line in result.Lines)
            {
                page.Canvas.DrawString(line.Text, font5, brush2, 0, y, format4);
                y = y + result.LineHeight;
            }
            PdfTextWidget textWidget = new PdfTextWidget(result.Remainder, font5, brush2);
            PdfTextLayout textLayout = new PdfTextLayout();
            textLayout.Break = PdfLayoutBreakType.FitPage;
            textLayout.Layout = PdfLayoutType.Paginate;
            RectangleF bounds = new RectangleF(new PointF(0, y), page.Canvas.ClientSize);
            textWidget.StringFormat = format4;
            textWidget.Draw(page, bounds, textLayout);
        }
    }
}

Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports Spire.Pdf.Security

Namespace DigitalSignature
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            'Create a pdf document.
            Dim doc As New PdfNewDocument()

            ' Create one page
            Dim page As PdfPageBase = doc.Pages.Add()

            'Draw the page
            DrawPage(page)

            Dim pfxPath As String = "Demo.pfx"
            Dim cert As New PdfCertificate(pfxPath, "e-iceblue")
            Dim signature As New PdfSignature(doc, page, cert, "demo")
            signature.ContactInfo = "Harry Hu"
            signature.Certificated = True
            signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill

            'Save pdf file.
            doc.Save("DigitalSignature.pdf")
            doc.Close()

            'Launching the Pdf file.
            Process.Start("DigitalSignature.pdf")
        End Sub

        Private Shared Sub DrawPage(ByVal page As PdfPageBase)
            Dim pageWidth As Single = page.Canvas.ClientSize.Width
            Dim y As Single = 0

            'page header
            Dim pen1 As New PdfPen(Color.LightGray, 1.0F)
            Dim brush1 As PdfBrush = New PdfSolidBrush(Color.LightGray)
            Dim font1 As New PdfTrueTypeFont(New Font("Arial", 8.0F, FontStyle.Italic))
            Dim format1 As New PdfStringFormat(PdfTextAlignment.Right)
            Dim text As String = "Demo of Spire.Pdf"
            page.Canvas.DrawString(text, font1, brush1, pageWidth, y, format1)
            Dim size As SizeF = font1.MeasureString(text, format1)
            y = y + size.Height + 1
            page.Canvas.DrawLine(pen1, 0, y, pageWidth, y)

            'title
            y = y + 5
            Dim brush2 As PdfBrush = New PdfSolidBrush(Color.Black)
            Dim font2 As New PdfTrueTypeFont(New Font("Arial", 16.0F, FontStyle.Bold))
            Dim format2 As New PdfStringFormat(PdfTextAlignment.Center)
            format2.CharacterSpacing = 1.0F
            text = "Summary of Science"
            page.Canvas.DrawString(text, font2, brush2, pageWidth / 2, y, format2)
            size = font2.MeasureString(text, format2)
            y = y + size.Height + 6

            'icon
            Dim image As PdfImage = PdfImage.FromFile("Wikipedia_Science.png")
            page.Canvas.DrawImage(image, New PointF(pageWidth - image.PhysicalDimension.Width, y))
            Dim imageLeftSpace As Single = pageWidth - image.PhysicalDimension.Width - 2
            Dim imageBottom As Single = image.PhysicalDimension.Height + y

            'refenrence content
            Dim font3 As New PdfTrueTypeFont(New Font("Arial", 9.0F))
            Dim format3 As New PdfStringFormat()
            format3.ParagraphIndent = font3.Size * 2
            format3.MeasureTrailingSpaces = True
            format3.LineSpacing = font3.Size * 1.5F
            Dim text1 As String = "(All text and picture from "
            Dim text2 As String = "Wikipedia"
            Dim text3 As String = ", the free encyclopedia)"
            page.Canvas.DrawString(text1, font3, brush2, 0, y, format3)

            size = font3.MeasureString(text1, format3)
            Dim x1 As Single = size.Width
            format3.ParagraphIndent = 0
            Dim font4 As New PdfTrueTypeFont(New Font("Arial", 9.0F, FontStyle.Underline))
            Dim brush3 As PdfBrush = PdfBrushes.Blue
            page.Canvas.DrawString(text2, font4, brush3, x1, y, format3)
            size = font4.MeasureString(text2, format3)
            x1 = x1 + size.Width

            page.Canvas.DrawString(text3, font3, brush2, x1, y, format3)
            y = y + size.Height

            'content
            Dim format4 As New PdfStringFormat()
            text = System.IO.File.ReadAllText("Summary_of_Science.txt")
            Dim font5 As New PdfTrueTypeFont(New Font("Arial", 10.0F))
            format4.LineSpacing = font5.Size * 1.5F
            Dim textLayouter As New PdfStringLayouter()
            Dim imageLeftBlockHeight As Single = imageBottom - y
            Dim result As PdfStringLayoutResult _
                = textLayouter.Layout(text, font5, format4, New SizeF(imageLeftSpace, imageLeftBlockHeight))
            If result.ActualSize.Height < imageBottom - y Then
                imageLeftBlockHeight = imageLeftBlockHeight + result.LineHeight
                result = textLayouter.Layout(text, font5, format4, New SizeF(imageLeftSpace, imageLeftBlockHeight))
            End If
            For Each line As LineInfo In result.Lines
                page.Canvas.DrawString(line.Text, font5, brush2, 0, y, format4)
                y = y + result.LineHeight
            Next line
            Dim textWidget As New PdfTextWidget(result.Remainder, font5, brush2)
            Dim textLayout As New PdfTextLayout()
            textLayout.Break = PdfLayoutBreakType.FitPage
            textLayout.Layout = PdfLayoutType.Paginate
            Dim bounds As New RectangleF(New PointF(0, y), page.Canvas.ClientSize)
            textWidget.StringFormat = format4
            textWidget.Draw(page, bounds, textLayout)
        End Sub
    End Class
End Namespace

The sample demonstrates how to set PDF properties for Silverlight via Spire.PDF.

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             x:Class="DocumentProperty_PDF.App">
             
    <Application.Resources>
        
    </Application.Resources>
</Application>

using System;
using System.Windows;

namespace DocumentProperty_PDF
{
    public partial class App : Application
    {

        public App()
        {
            this.Startup += this.Application_Startup;
            this.Exit += this.Application_Exit;
            this.UnhandledException += this.Application_UnhandledException;

            InitializeComponent();
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            this.RootVisual = new MainPage();
        }

        private void Application_Exit(object sender, EventArgs e)
        {

        }

        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            // If the app is running outside of the debugger then report the exception using
            // the browser's exception mechanism. On IE this will display it a yellow alert 
            // icon in the status bar and Firefox will display a script error.
            if (!System.Diagnostics.Debugger.IsAttached)
            {

                // NOTE: This will allow the application to continue running after an exception has been thrown
                // but not handled. 
                // For production applications this error handling should be replaced with something that will 
                // report the error to the website and stop the application.
                e.Handled = true;
                Deployment.Current.Dispatcher.BeginInvoke(delegate { ReportErrorToDOM(e); });
            }
        }

        private void ReportErrorToDOM(ApplicationUnhandledExceptionEventArgs e)
        {
            try
            {
                string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace;
                errorMsg = errorMsg.Replace('"', '\'').Replace("\r\n", @"\n");

                System.Windows.Browser.HtmlPage.Window.Eval("throw new Error(\"Unhandled Error in Silverlight Application " + errorMsg + "\");");
            }
            catch (Exception)
            {
            }
        }
    }
}

Imports System.Windows

Namespace DocumentProperty_PDF
	Partial Public Class App
		Inherits Application

		Public Sub New()
			AddHandler Me.Startup, AddressOf Application_Startup
			AddHandler Me.Exit, AddressOf Application_Exit
			AddHandler Me.UnhandledException, AddressOf Application_UnhandledException

			InitializeComponent()
		End Sub

		Private Sub Application_Startup(ByVal sender As Object, ByVal e As StartupEventArgs)
			Me.RootVisual = New MainPage()
		End Sub

		Private Sub Application_Exit(ByVal sender As Object, ByVal e As EventArgs)

		End Sub

		Private Sub Application_UnhandledException(ByVal sender As Object, ByVal e As ApplicationUnhandledExceptionEventArgs)
			' If the app is running outside of the debugger then report the exception using
			' the browser's exception mechanism. On IE this will display it a yellow alert 
			' icon in the status bar and Firefox will display a script error.
			If Not Debugger.IsAttached Then

				' NOTE: This will allow the application to continue running after an exception has been thrown
				' but not handled. 
				' For production applications this error handling should be replaced with something that will 
				' report the error to the website and stop the application.
				e.Handled = True
				Deployment.Current.Dispatcher.BeginInvoke(Sub() ReportErrorToDOM(e))
			End If
		End Sub

		Private Sub ReportErrorToDOM(ByVal e As ApplicationUnhandledExceptionEventArgs)
			Try
				Dim errorMsg As String = e.ExceptionObject.Message + e.ExceptionObject.StackTrace
				errorMsg = errorMsg.Replace(""""c, "'"c).Replace(vbCrLf, vbLf)

				System.Windows.Browser.HtmlPage.Window.Eval("throw new Error(""Unhandled Error in Silverlight Application " & errorMsg & """);")
			Catch e1 As Exception
			End Try
		End Sub
	End Class
End Namespace

<UserControl x:Class="DocumentProperty_PDF.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White" Loaded="LayoutRoot_Loaded">
        <Button Content="RUN" Height="23" HorizontalAlignment="Left" Margin="313,265,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
    </Grid>
</UserControl>    

using System.Windows;
using System.Windows.Controls;
using System.IO;

using Spire.Pdf;
using Spire.Pdf.Graphics;

namespace DocumentProperty_PDF
{
    public partial class MainPage : UserControl
    {
        private SaveFileDialog saveFile = new SaveFileDialog();
        public MainPage()
        {
            InitializeComponent();
            this.saveFile = new SaveFileDialog();
            this.saveFile.Filter = "PDF Document(*.pdf)|*.pdf";
        }

        private void LayoutRoot_Loaded(object sender, RoutedEventArgs e)
        {

        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            //create a pdfDocument
            PdfDocument document = new PdfDocument();

            //add one page
            PdfPageBase page = document.Pages.Add();

            //draw the content
            page.Canvas.DrawString("This is a sample demonstrates how to set document properties",
               new PdfFont(PdfFontFamily.Helvetica, 10f), PdfBrushes.Black, new System.Drawing.PointF(0, 5));

            //set the document properties
            document.DocumentInformation.Author = "Suvi Wu";
            document.DocumentInformation.Creator = "Harry Hu";
            document.DocumentInformation.Keywords = "pdf, demo, document information"; 
            document.DocumentInformation.Producer = "Spire.Pdf";
            document.DocumentInformation.Subject = "Demo of Spire.Pdf";
            document.DocumentInformation.Title = "Document Information";

            //set the document fileInfo
            document.FileInfo.CrossReferenceType = PdfCrossReferenceType.CrossReferenceStream;
            document.FileInfo.IncrementalUpdate = false;
            document.FileInfo.Version = PdfVersion.Version1_5;

            //save the pdfDocument using saveFileDialog
            bool? result = this.saveFile.ShowDialog();
            if (result.HasValue && result.Value)
            {
                using (Stream stream = this.saveFile.OpenFile())
                {
                    document.SaveToStream(stream);
                }
            }
        }
    }
}

Imports System.Windows
Imports System.Windows.Controls
Imports System.IO

Imports Spire.Pdf
Imports Spire.Pdf.Graphics

Namespace DocumentProperty_PDF
	Partial Public Class MainPage
		Inherits UserControl
		Private saveFile As New SaveFileDialog()
		Public Sub New()
			InitializeComponent()
			Me.saveFile = New SaveFileDialog()
			Me.saveFile.Filter = "PDF Document(*.pdf)|*.pdf"
		End Sub

		Private Sub LayoutRoot_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)

		End Sub

		Private Sub button1_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
			'create a pdfDocument
			Dim document As New PdfDocument()

			'add one page
			Dim page As PdfPageBase = document.Pages.Add()

			'draw the content
			page.Canvas.DrawString("This is a sample demonstrates how to set document properties", New PdfFont(PdfFontFamily.Helvetica, 10f), PdfBrushes.Black, New System.Drawing.PointF(0, 5))

			'set the document properties
			document.DocumentInformation.Author = "Suvi Wu"
			document.DocumentInformation.Creator = "Harry Hu"
			document.DocumentInformation.Keywords = "pdf, demo, document information"
			document.DocumentInformation.Producer = "Spire.Pdf"
			document.DocumentInformation.Subject = "Demo of Spire.Pdf"
			document.DocumentInformation.Title = "Document Information"

			'set the document fileInfo
			document.FileInfo.CrossReferenceType = PdfCrossReferenceType.CrossReferenceStream
			document.FileInfo.IncrementalUpdate = False
			document.FileInfo.Version = PdfVersion.Version1_5

			'save the pdfDocument using saveFileDialog
			Dim result? As Boolean = Me.saveFile.ShowDialog()
			If result.HasValue AndAlso result.Value Then
				Using stream As Stream = Me.saveFile.OpenFile()
					document.SaveToStream(stream)
				End Using
			End If
		End Sub
	End Class
End Namespace

The sample demonstrates how to merge multiple PDF documents to one PDF document.

(NO screenshot)

using System;
using Spire.Pdf;

namespace MergeDocuments
{
    class Program
    {
        static void Main(string[] args)
        {
            //pdf document list
            String[] files = new String[]
            {
                @"Sample3.pdf",
                @"Sample2.pdf",
                @"Sample1.pdf"
            };
            //open pdf documents            
            PdfDocument[] docs = new PdfDocument[files.Length];
            for (int i = 0; i < files.Length; i++)
            {
                docs[i] = new PdfDocument(files[i]);
            }

            //append document
            docs[0].AppendPage(docs[1]);

            //import page
            for (int i = 0; i < docs[2].Pages.Count; i = i + 2)
            {
                docs[0].InsertPage(docs[2], i);
            }

            //Save pdf file.
            docs[0].SaveToFile("MergeDocuments.pdf");

            //close
            foreach (PdfDocument doc in docs)
            {
                doc.Close();
            }

            //Launching the Pdf file.
            System.Diagnostics.Process.Start("MergeDocuments.pdf");
        }
    }
}

Imports Spire.Pdf

Namespace MergeDocuments
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            'pdf document list
            Dim files() As String = {"Sample3.pdf", "Sample2.pdf", "Sample1.pdf"}
            'open pdf documents            
            Dim docs(files.Length - 1) As PdfDocument
            For i As Integer = 0 To files.Length - 1
                docs(i) = New PdfDocument(files(i))
            Next i

            'append document
            docs(0).AppendPage(docs(1))

            'import page
            For i As Integer = 0 To docs(2).Pages.Count - 1 Step 2
                docs(0).InsertPage(docs(2), i)
            Next i

            'Save pdf file.
            docs(0).SaveToFile("MergeDocuments.pdf")

            'close
            For Each doc As PdfDocument In docs
                doc.Close()
            Next doc

            'Launching the Pdf file.
            Process.Start("MergeDocuments.pdf")
        End Sub

    End Class
End Namespace

The sample demonstrates how to draw barcode in PDF document.

Download Barcode.pdf

using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Barcode;

namespace Barcode
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a pdf document.
            PdfDocument doc = new PdfDocument();

            //margin
            PdfUnitConvertor unitCvtr = new PdfUnitConvertor();
            PdfMargins margin = new PdfMargins();
            margin.Top = unitCvtr.ConvertUnits(2.54f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);
            margin.Bottom = margin.Top;
            margin.Left = unitCvtr.ConvertUnits(3.17f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point);
            margin.Right = margin.Left;

            PdfSection section = doc.Sections.Add();
            section.PageSettings.Margins = margin;
            section.PageSettings.Size = PdfPageSize.A4;

            // Create one page
            PdfPageBase page = section.Pages.Add();
            float y = 10;

            PdfBrush brush1 = PdfBrushes.Black;
            PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Arial", 12f, FontStyle.Bold), true);
            RectangleF rctg = new RectangleF(new PointF(0, 0), page.Canvas.ClientSize);
            PdfLinearGradientBrush brush2
                = new PdfLinearGradientBrush(rctg, Color.Navy, Color.OrangeRed, PdfLinearGradientMode.Vertical);

            //draw Codabar
            PdfTextWidget text = new PdfTextWidget();
            text.Font = font1;
            text.Text = "Codabar:";
            PdfLayoutResult result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCodabarBarcode barcode1 = new PdfCodabarBarcode("00:12-3456/7890");
            barcode1.BarcodeToTextGapHeight = 1f;
            barcode1.EnableCheckDigit = true;
            barcode1.ShowCheckDigit = true;
            barcode1.TextDisplayLocation = TextLocation.Bottom;
            barcode1.TextColor = Color.Blue;
            barcode1.Draw(page, new PointF(0, y));
            y = barcode1.Bounds.Bottom + 5;


            //draw Code11Barcode
            text.Text = "Code11:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode11Barcode barcode2 = new PdfCode11Barcode("123-4567890");
            barcode2.BarcodeToTextGapHeight = 1f;
            barcode2.TextDisplayLocation = TextLocation.Bottom;
            barcode2.TextColor = Color.Blue;
            barcode2.Draw(page, new PointF(0, y));
            y = barcode2.Bounds.Bottom + 5;


            //draw Code128-A
            text.Text = "Code128-A:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode128ABarcode barcode3 = new PdfCode128ABarcode("HELLO 00-123");
            barcode3.BarcodeToTextGapHeight = 1f;
            barcode3.TextDisplayLocation = TextLocation.Bottom;
            barcode3.TextColor = Color.Blue;
            barcode3.Draw(page, new PointF(0, y));
            y = barcode3.Bounds.Bottom + 5;


            //draw Code128-B
            text.Text = "Code128-B:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode128BBarcode barcode4 = new PdfCode128BBarcode("Hello 00-123");
            barcode4.BarcodeToTextGapHeight = 1f;
            barcode4.TextDisplayLocation = TextLocation.Bottom;
            barcode4.TextColor = Color.Blue;
            barcode4.Draw(page, new PointF(0, y));
            y = barcode4.Bounds.Bottom + 5;


            //draw Code32
            text.Text = "Code32:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode32Barcode barcode5 = new PdfCode32Barcode("16273849");
            barcode5.BarcodeToTextGapHeight = 1f;
            barcode5.TextDisplayLocation = TextLocation.Bottom;
            barcode5.TextColor = Color.Blue;
            barcode5.Draw(page, new PointF(0, y));
            y = barcode5.Bounds.Bottom + 5;

            page = section.Pages.Add();
            y = 10;


            //draw Code39
            text.Text = "Code39:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode39Barcode barcode6 = new PdfCode39Barcode("16-273849");
            barcode6.BarcodeToTextGapHeight = 1f;
            barcode6.TextDisplayLocation = TextLocation.Bottom;
            barcode6.TextColor = Color.Blue;
            barcode6.Draw(page, new PointF(0, y));
            y = barcode6.Bounds.Bottom + 5;


            //draw Code39-E
            text.Text = "Code39-E:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode39ExtendedBarcode barcode7 = new PdfCode39ExtendedBarcode("16-273849");
            barcode7.BarcodeToTextGapHeight = 1f;
            barcode7.TextDisplayLocation = TextLocation.Bottom;
            barcode7.TextColor = Color.Blue;
            barcode7.Draw(page, new PointF(0, y));
            y = barcode7.Bounds.Bottom + 5;


            //draw Code93
            text.Text = "Code93:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode93Barcode barcode8 = new PdfCode93Barcode("16-273849");
            barcode8.BarcodeToTextGapHeight = 1f;
            barcode8.TextDisplayLocation = TextLocation.Bottom;
            barcode8.TextColor = Color.Blue;
            barcode8.QuietZone.Bottom = 5;
            barcode8.Draw(page, new PointF(0, y));
            y = barcode8.Bounds.Bottom + 5;


            //draw Code93-E
            text.Text = "Code93-E:";
            result = text.Draw(page, 0, y);
            page = result.Page;
            y = result.Bounds.Bottom + 2;

            PdfCode93ExtendedBarcode barcode9 = new PdfCode93ExtendedBarcode("16-273849");
            barcode9.BarcodeToTextGapHeight = 1f;
            barcode9.TextDisplayLocation = TextLocation.Bottom;
            barcode9.TextColor = Color.Blue;
            barcode9.Draw(page, new PointF(0, y));
            y = barcode9.Bounds.Bottom + 5;


            //Save pdf file.
            doc.SaveToFile("Barcode.pdf");
            doc.Close();

            //Launching the Pdf file.
            System.Diagnostics.Process.Start("Barcode.pdf");
        }
    }
}

Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports Spire.Pdf.Barcode

Namespace Barcode
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            'Create a pdf document.
            Dim doc As New PdfDocument()

            'margin
            Dim unitCvtr As New PdfUnitConvertor()
            Dim margin As New PdfMargins()
            margin.Top = unitCvtr.ConvertUnits(2.54F, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point)
            margin.Bottom = margin.Top
            margin.Left = unitCvtr.ConvertUnits(3.17F, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point)
            margin.Right = margin.Left

            Dim section As PdfSection = doc.Sections.Add()
            section.PageSettings.Margins = margin
            section.PageSettings.Size = PdfPageSize.A4

            ' Create one page
            Dim page As PdfPageBase = section.Pages.Add()
            Dim y As Single = 10

            Dim brush1 As PdfBrush = PdfBrushes.Black
            Dim font1 As New PdfTrueTypeFont(New Font("Arial", 12.0F, FontStyle.Bold), True)
            Dim rctg As New RectangleF(New PointF(0, 0), page.Canvas.ClientSize)
            Dim brush2 As New PdfLinearGradientBrush(rctg, Color.Navy, Color.OrangeRed, PdfLinearGradientMode.Vertical)

            'draw Codabar
            Dim text As New PdfTextWidget()
            text.Font = font1
            text.Text = "Codabar:"
            Dim result As PdfLayoutResult = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode1 As New PdfCodabarBarcode("00:12-3456/7890")
            barcode1.BarcodeToTextGapHeight = 1.0F
            barcode1.EnableCheckDigit = True
            barcode1.ShowCheckDigit = True
            barcode1.TextDisplayLocation = TextLocation.Bottom
            barcode1.TextColor = Color.Blue
            barcode1.Draw(page, New PointF(0, y))
            y = barcode1.Bounds.Bottom + 5


            'draw Code11Barcode
            text.Text = "Code11:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode2 As New PdfCode11Barcode("123-4567890")
            barcode2.BarcodeToTextGapHeight = 1.0F
            barcode2.TextDisplayLocation = TextLocation.Bottom
            barcode2.TextColor = Color.Blue
            barcode2.Draw(page, New PointF(0, y))
            y = barcode2.Bounds.Bottom + 5


            'draw Code128-A
            text.Text = "Code128-A:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode3 As New PdfCode128ABarcode("HELLO 00-123")
            barcode3.BarcodeToTextGapHeight = 1.0F
            barcode3.TextDisplayLocation = TextLocation.Bottom
            barcode3.TextColor = Color.Blue
            barcode3.Draw(page, New PointF(0, y))
            y = barcode3.Bounds.Bottom + 5


            'draw Code128-B
            text.Text = "Code128-B:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode4 As New PdfCode128BBarcode("Hello 00-123")
            barcode4.BarcodeToTextGapHeight = 1.0F
            barcode4.TextDisplayLocation = TextLocation.Bottom
            barcode4.TextColor = Color.Blue
            barcode4.Draw(page, New PointF(0, y))
            y = barcode4.Bounds.Bottom + 5


            'draw Code32
            text.Text = "Code32:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode5 As New PdfCode32Barcode("16273849")
            barcode5.BarcodeToTextGapHeight = 1.0F
            barcode5.TextDisplayLocation = TextLocation.Bottom
            barcode5.TextColor = Color.Blue
            barcode5.Draw(page, New PointF(0, y))
            y = barcode5.Bounds.Bottom + 5

            page = section.Pages.Add()
            y = 10


            'draw Code39
            text.Text = "Code39:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode6 As New PdfCode39Barcode("16-273849")
            barcode6.BarcodeToTextGapHeight = 1.0F
            barcode6.TextDisplayLocation = TextLocation.Bottom
            barcode6.TextColor = Color.Blue
            barcode6.Draw(page, New PointF(0, y))
            y = barcode6.Bounds.Bottom + 5


            'draw Code39-E
            text.Text = "Code39-E:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode7 As New PdfCode39ExtendedBarcode("16-273849")
            barcode7.BarcodeToTextGapHeight = 1.0F
            barcode7.TextDisplayLocation = TextLocation.Bottom
            barcode7.TextColor = Color.Blue
            barcode7.Draw(page, New PointF(0, y))
            y = barcode7.Bounds.Bottom + 5


            'draw Code93
            text.Text = "Code93:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode8 As New PdfCode93Barcode("16-273849")
            barcode8.BarcodeToTextGapHeight = 1.0F
            barcode8.TextDisplayLocation = TextLocation.Bottom
            barcode8.TextColor = Color.Blue
            barcode8.QuietZone.Bottom = 5
            barcode8.Draw(page, New PointF(0, y))
            y = barcode8.Bounds.Bottom + 5


            'draw Code93-E
            text.Text = "Code93-E:"
            result = text.Draw(page, 0, y)
            page = result.Page
            y = result.Bounds.Bottom + 2

            Dim barcode9 As New PdfCode93ExtendedBarcode("16-273849")
            barcode9.BarcodeToTextGapHeight = 1.0F
            barcode9.TextDisplayLocation = TextLocation.Bottom
            barcode9.TextColor = Color.Blue
            barcode9.Draw(page, New PointF(0, y))
            y = barcode9.Bounds.Bottom + 5


            'Save pdf file.
            doc.SaveToFile("Barcode.pdf")
            doc.Close()

            'Launching the Pdf file.
            Process.Start("Barcode.pdf")
        End Sub
    End Class
End Namespace

The sample demonstrates how to Set PDF Text Format for Silverlight via Spire.PDF.

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             x:Class="TextFormat_PDF.App">
             
    <Application.Resources>
        
    </Application.Resources>
</Application>

using System;
using System.Windows;

namespace TextFormat_PDF
{
    public partial class App : Application
    {

        public App()
        {
            this.Startup += this.Application_Startup;
            this.Exit += this.Application_Exit;
            this.UnhandledException += this.Application_UnhandledException;

            InitializeComponent();
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            this.RootVisual = new MainPage();
        }

        private void Application_Exit(object sender, EventArgs e)
        {

        }

        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            // If the app is running outside of the debugger then report the exception using
            // the browser's exception mechanism. On IE this will display it a yellow alert 
            // icon in the status bar and Firefox will display a script error.
            if (!System.Diagnostics.Debugger.IsAttached)
            {

                // NOTE: This will allow the application to continue running after an exception has been thrown
                // but not handled. 
                // For production applications this error handling should be replaced with something that will 
                // report the error to the website and stop the application.
                e.Handled = true;
                Deployment.Current.Dispatcher.BeginInvoke(delegate { ReportErrorToDOM(e); });
            }
        }

        private void ReportErrorToDOM(ApplicationUnhandledExceptionEventArgs e)
        {
            try
            {
                string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace;
                errorMsg = errorMsg.Replace('"', '\'').Replace("\r\n", @"\n");

                System.Windows.Browser.HtmlPage.Window.Eval("throw new Error(\"Unhandled Error in Silverlight Application " + errorMsg + "\");");
            }
            catch (Exception)
            {
            }
        }
    }
}

Imports System.Windows

Namespace TextFormat_PDF
	Partial Public Class App
		Inherits Application

		Public Sub New()
			AddHandler Me.Startup, AddressOf Application_Startup
			AddHandler Me.Exit, AddressOf Application_Exit
			AddHandler Me.UnhandledException, AddressOf Application_UnhandledException

			InitializeComponent()
		End Sub

		Private Sub Application_Startup(ByVal sender As Object, ByVal e As StartupEventArgs)
			Me.RootVisual = New MainPage()
		End Sub

		Private Sub Application_Exit(ByVal sender As Object, ByVal e As EventArgs)

		End Sub

		Private Sub Application_UnhandledException(ByVal sender As Object, ByVal e As ApplicationUnhandledExceptionEventArgs)
			' If the app is running outside of the debugger then report the exception using
			' the browser's exception mechanism. On IE this will display it a yellow alert 
			' icon in the status bar and Firefox will display a script error.
			If Not Debugger.IsAttached Then

				' NOTE: This will allow the application to continue running after an exception has been thrown
				' but not handled. 
				' For production applications this error handling should be replaced with something that will 
				' report the error to the website and stop the application.
				e.Handled = True
				Deployment.Current.Dispatcher.BeginInvoke(Sub() ReportErrorToDOM(e))
			End If
		End Sub

		Private Sub ReportErrorToDOM(ByVal e As ApplicationUnhandledExceptionEventArgs)
			Try
				Dim errorMsg As String = e.ExceptionObject.Message + e.ExceptionObject.StackTrace
				errorMsg = errorMsg.Replace(""""c, "'"c).Replace(vbCrLf, vbLf)

				System.Windows.Browser.HtmlPage.Window.Eval("throw new Error(""Unhandled Error in Silverlight Application " & errorMsg & """);")
			Catch e1 As Exception
			End Try
		End Sub
	End Class
End Namespace

<UserControl x:Class="TextFormat_PDF.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <Button Content="Run" Height="23" HorizontalAlignment="Left" Margin="296,265,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
    </Grid>
</UserControl>    

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.IO;
using System.Drawing;

using Spire.Pdf;
using Spire.Pdf.Graphics;

namespace TextFormat_PDF
{
    public partial class MainPage : UserControl
    {
        private SaveFileDialog saveFileDialog = null;
        public MainPage()
        {
            InitializeComponent();
            this.saveFileDialog = new SaveFileDialog();
            this.saveFileDialog.Filter = "PDF Documents(*.pdf)|*.pdf";
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            //create a blank pdf document
            PdfDocument pdfDoc = new PdfDocument();

            //add one page
            PdfPageBase page = pdfDoc.Pages.Add();

            //draw text and set the text format
            float y = 10;
            float pageWidth = page.Canvas.ClientSize.Width;
            SizeF size = new SizeF();
            string text = "This is a sample demonstrates how to set text format using Spire.pdf ";
            PdfFont font = new PdfFont(PdfFontFamily.TimesRoman, 18);
            PdfBrush brush = PdfBrushes.Red;
            PdfStringFormat format1 = new PdfStringFormat(PdfTextAlignment.Left);
            page.Canvas.DrawString(text, font, brush, 0, y, format1);
            y = y + size.Height + 30;
            PdfBrush brush1 = new PdfSolidBrush(Colors.Black);
            PdfFont font1 = new PdfFont(PdfFontFamily.Helvetica, 12);
            format1.CharacterSpacing = 1f;

            text = "This is a left aligned string ";
            size = font1.MeasureString(text, format1);
            page.Canvas.DrawString(text, font1, brush1, 0, y, format1);
            y = y + size.Height;
            page.Canvas.DrawString(text, font1, brush1, 0, y, format1);
            size = font1.MeasureString(text, format1);
            y = y + size.Height + 6;

            text = "This is a center aligned string";
            format1.Alignment = PdfTextAlignment.Center;
            PdfBrush brush2 = PdfBrushes.Blue;
            PdfFont font2 = new PdfFont(PdfFontFamily.Courier, 12);
            size = font2.MeasureString(text, format1);
            page.Canvas.DrawString(text, font2, brush2, pageWidth / 2, y, format1);
            y = y + size.Height;
            page.Canvas.DrawString(text, font2, brush2, pageWidth / 2, y, format1);
            y = y + size.Height + 6;

            text = "This is a right aligned string";
            format1.Alignment = PdfTextAlignment.Right;
            PdfBrush brush3 = PdfBrushes.Green;
            PdfFont font3 = new PdfFont(PdfFontFamily.TimesRoman, 12);
            size = font3.MeasureString(text, format1);
            page.Canvas.DrawString(text, font3, brush3, pageWidth, y, format1);
            y = y + size.Height;
            page.Canvas.DrawString(text, font3, brush3, pageWidth, y, format1);

            //save the pdf document
            bool? result = this.saveFileDialog.ShowDialog();
            if (result.HasValue && result.Value)
            {
                using (Stream stream = this.saveFileDialog.OpenFile())
                {
                    pdfDoc.SaveToStream(stream);
                }
            }
        }
    }
}

Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.IO
Imports System.Drawing

Imports Spire.Pdf
Imports Spire.Pdf.Graphics

Namespace TextFormat_PDF
	Partial Public Class MainPage
		Inherits UserControl
		Private saveFileDialog As SaveFileDialog = Nothing
		Public Sub New()
			InitializeComponent()
			Me.saveFileDialog = New SaveFileDialog()
			Me.saveFileDialog.Filter = "PDF Documents(*.pdf)|*.pdf"
		End Sub

		Private Sub button1_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
			'create a blank pdf document
			Dim pdfDoc As New PdfDocument()

			'add one page
			Dim page As PdfPageBase = pdfDoc.Pages.Add()

			'draw text and set the text format
			Dim y As Single = 10
			Dim pageWidth As Single = page.Canvas.ClientSize.Width
			Dim size As New SizeF()
			Dim text As String = "This is a sample demonstrates how to set text format using Spire.pdf "
			Dim font As New PdfFont(PdfFontFamily.TimesRoman, 18)
			Dim brush As PdfBrush = PdfBrushes.Red
			Dim format1 As New PdfStringFormat(PdfTextAlignment.Left)
			page.Canvas.DrawString(text, font, brush, 0, y, format1)
			y = y + size.Height + 30
			Dim brush1 As PdfBrush = New PdfSolidBrush(Colors.Black)
			Dim font1 As New PdfFont(PdfFontFamily.Helvetica, 12)
			format1.CharacterSpacing = 1f

			text = "This is a left aligned string "
			size = font1.MeasureString(text, format1)
			page.Canvas.DrawString(text, font1, brush1, 0, y, format1)
			y = y + size.Height
			page.Canvas.DrawString(text, font1, brush1, 0, y, format1)
			size = font1.MeasureString(text, format1)
			y = y + size.Height + 6

			text = "This is a center aligned string"
			format1.Alignment = PdfTextAlignment.Center
			Dim brush2 As PdfBrush = PdfBrushes.Blue
			Dim font2 As New PdfFont(PdfFontFamily.Courier, 12)
			size = font2.MeasureString(text, format1)
			page.Canvas.DrawString(text, font2, brush2, pageWidth / 2, y, format1)
			y = y + size.Height
			page.Canvas.DrawString(text, font2, brush2, pageWidth / 2, y, format1)
			y = y + size.Height + 6

			text = "This is a right aligned string"
			format1.Alignment = PdfTextAlignment.Right
			Dim brush3 As PdfBrush = PdfBrushes.Green
			Dim font3 As New PdfFont(PdfFontFamily.TimesRoman, 12)
			size = font3.MeasureString(text, format1)
			page.Canvas.DrawString(text, font3, brush3, pageWidth, y, format1)
			y = y + size.Height
			page.Canvas.DrawString(text, font3, brush3, pageWidth, y, format1)

			'save the pdf document
			Dim result? As Boolean = Me.saveFileDialog.ShowDialog()
			If result.HasValue AndAlso result.Value Then
				Using stream As Stream = Me.saveFileDialog.OpenFile()
					pdfDoc.SaveToStream(stream)
				End Using
			End If
		End Sub
	End Class
End Namespace