pip install Spire.PDF

from spire.pdf.common import *
from spire.pdf import *

# Specify the input and output file paths
inputFile = "sample.pdf"
outputFile = "ToXPS.xps"

# Create an object of the PdfDocument class
pdf = PdfDocument()
# Load the sample PDF file
pdf.LoadFromFile(inputFile)

# Save the PDF file to the XPS file format
pdf.SaveToFile(outputFile, FileFormat.XPS)
# Close the PdfDocument object
pdf.Close()

PM> Install-Package Spire.XLS

using Spire.Xls;
using Spire.Xls.AI;
using System.IO;
using System.Text;

// Define the file path of the Excel document 
string inputfile = "Input.xlsx";

// Create a new instance of the Workbook
Workbook wb = new Workbook();

// Load the Excel file
wb.LoadFromFile(inputfile);

// Create a new instance of the ExcelAI
ExcelAI excelAI = new ExcelAI();

// Upload the workbook and obtain the file path where it's stored in the AI system
string fpath = excelAI.UploadWorkbook(wb);

// Set the question1 to be asked to the AI system
string question1 = "The document discusses what topic? And please generate 3 topics for the upcoming conversation";

// Execute a smart search task based on the provided question for the Excel file
string answer1 =excelAI.DocumentSearch(question1, fpath, true);

// Set the question2 to be asked to the AI system
string question2 = "Please expand the first generated topic";

// Execute an ask task to ask question for AI system
string answer2 = excelAI.Ask(question2, true);

// Set the question3 to be asked to the AI system
string question3 = "How to use IF function in Excel to achieve multi condition judgment?";

// Reset the chat history for the current session
excelAI.ResetChatHistory(excelAI.SessionID);

// Execute an ask task to ask question for AI system
string answer3 = excelAI.Ask(question3, true);

// Create a StringBuilder object to append the answers
StringBuilder builder = new StringBuilder();
builder.AppendLine("Answer1:  "+answer1);
builder.AppendLine("-------------------------------------------------------------------");
builder.AppendLine("Answer2:  " + answer2);
builder.AppendLine("-------------------------------------------------------------------");
builder.AppendLine("Answer3:  " + answer3);

// Write the answer to the txt file
File.WriteAllText("ChatWithExcel.txt", builder.ToString());

PM> Install-Package Spire.Doc

// Create a new document object
Document document = new Document();

// Load a document
document.LoadFromFile("Sample.docx");

// Get the body of the last section of the document
Body body = document.LastSection.Body;

// Insert a page break after the last paragraph in the body
body.LastParagraph.AppendBreak(BreakType.PageBreak);

// Create a new paragraph style
ParagraphStyle paragraphStyle = new ParagraphStyle(document);
paragraphStyle.Name = "CustomParagraphStyle1";
paragraphStyle.ParagraphFormat.LineSpacing = 12;
paragraphStyle.ParagraphFormat.AfterSpacing = 8;
paragraphStyle.CharacterFormat.FontName = "Microsoft YaHei";
paragraphStyle.CharacterFormat.FontSize = 12;

// Add the paragraph style to the document's style collection
document.Styles.Add(paragraphStyle);

// Create a new paragraph and set the text content
Paragraph paragraph = new Paragraph(document);
paragraph.AppendText("Thank you for using our Spire.Doc for .NET product. The trial version will add a red watermark to the generated document and only supports converting the first 10 pages to other formats. Upon purchasing and applying a license, these watermarks will be removed, and the functionality restrictions will be lifted.");

// Apply the paragraph style
paragraph.ApplyStyle(paragraphStyle.Name);

// Add the paragraph to the body's content collection
body.ChildObjects.Add(paragraph);

// Create another new paragraph and set the text content
paragraph = new Paragraph(document);
paragraph.AppendText("To experience our product more fully, we provide a one-month temporary license free of charge to each of our customers. Please send an email to sales@e-iceblue.com, and we will send the license to you within one working day.");

// Apply the paragraph style
paragraph.ApplyStyle(paragraphStyle.Name);

// Add the paragraph to the body's content collection
body.ChildObjects.Add(paragraph);

// Save the document to the specified path
document.SaveToFile("Add a Page.docx", FileFormat.Docx);

// Close the document
document.Close();

// Release the resources of the document object
document.Dispose();

using Spire.Doc;
using Spire.Doc.Pages;
using Spire.Doc.Documents;

namespace SpireDocDemo
{
    internal class Program
    {
        static void Main(string[] args)
        {
           // Create a new document object
            Document document = new Document();

            // Load the sample document from a file
            document.LoadFromFile("Sample.docx");

            // Create a fixed layout document object
            FixedLayoutDocument layoutDoc = new FixedLayoutDocument(document);

            // Get the first page
            FixedLayoutPage page = layoutDoc.Pages[0];

            // Get the body of the document
            Body body = page.Section.Body;

            // Get the last paragraph of the current page
            Paragraph paragraphEnd = page.Columns[0].Lines[page.Columns[0].Lines.Count - 1].Paragraph;

            // Initialize the end index
            int endIndex = 0;
            if (paragraphEnd != null)
            {
                // Get the index of the last paragraph
                endIndex = body.ChildObjects.IndexOf(paragraphEnd);
            }

            // Create a new paragraph style
            ParagraphStyle paragraphStyle = new ParagraphStyle(document);
            paragraphStyle.Name = "CustomParagraphStyle1";
            paragraphStyle.ParagraphFormat.LineSpacing = 12;
            paragraphStyle.ParagraphFormat.AfterSpacing = 8;
            paragraphStyle.CharacterFormat.FontName = "Microsoft YaHei";
            paragraphStyle.CharacterFormat.FontSize = 12;

            // Add the paragraph style to the document's style collection
            document.Styles.Add(paragraphStyle);

            // Create a new paragraph and set the text content
            Paragraph paragraph = new Paragraph(document);
            paragraph.AppendText("Thank you for using our Spire.Doc for .NET product. The trial version will add a red watermark to the generated document and only supports converting the first 10 pages to other formats. Upon purchasing and applying a license, these watermarks will be removed, and the functionality restrictions will be lifted.");

            // Apply the paragraph style
            paragraph.ApplyStyle(paragraphStyle.Name);

            // Insert the paragraph at the specified position
            body.ChildObjects.Insert(endIndex + 1, paragraph);

            // Create another new paragraph
            paragraph = new Paragraph(document);
            paragraph.AppendText("To experience our product more fully, we provide a one-month temporary license free of charge to each of our customers. Please send an email to sales@e-iceblue.com, and we will send the license to you within one working day.");

            // Apply the paragraph style
            paragraph.ApplyStyle(paragraphStyle.Name);

            // Add a page break
            paragraph.AppendBreak(BreakType.PageBreak);

            // Insert the paragraph at the specified position
            body.ChildObjects.Insert(endIndex + 2, paragraph);

            // Save the document to the specified path
            document.SaveToFile("Insert a Page.docx", Spire.Doc.FileFormat.Docx);

            // Close and release the original document
            document.Close();
            document.Dispose();
        }
    }
}

using Spire.Doc;
using Spire.Doc.Pages;
using Spire.Doc.Documents;

namespace SpireDocDemo
{
    internal class Program
    {
        static void Main(string[] args)
        {
           // Create a new document object
            Document document = new Document();

            // Load the sample document from a file
            document.LoadFromFile("Sample.docx");

            // Create a fixed layout document object
            FixedLayoutDocument layoutDoc = new FixedLayoutDocument(document);

            // Get the second page
            FixedLayoutPage page = layoutDoc.Pages[1];

            // Get the section of the page
            Section section = page.Section;

            // Get the first paragraph on the first page
            Paragraph paragraphStart = page.Columns[0].Lines[0].Paragraph;
            int startIndex = 0;
            if (paragraphStart != null)
            {
                // Get the index of the starting paragraph
                startIndex = section.Body.ChildObjects.IndexOf(paragraphStart);
            }

            // Get the last paragraph on the last page
            Paragraph paragraphEnd = page.Columns[0].Lines[page.Columns[0].Lines.Count - 1].Paragraph;

            int endIndex = 0;
            if (paragraphEnd != null)
            {
                // Get the index of the ending paragraph
                endIndex = section.Body.ChildObjects.IndexOf(paragraphEnd);
            }

            // Delete all content within the specified range
            for (int i = 0; i <= (endIndex - startIndex); i++)
            {
                section.Body.ChildObjects.RemoveAt(startIndex);
            }

            // Save the document to the specified path
            document.SaveToFile("Delete a Page.docx", Spire.Doc.FileFormat.Docx);

            // Close and release the original document
            document.Close();
            document.Dispose();
        }
    }
}