This article reveals using Spire.XLS for .NET to create a new Excel file dynamically and save it to stream. Alternatively, loading Excel file from stream in C# will also be fully described in this article as an additional function of Spire.XLS for .NET.

First we need to complete the preparatory work:

  • Download the latest Spire.XLS and install it on your machine.
  • Add the Spire.XLS.dll files as reference.
  • Open bin folder and select the three dll files under .NET 4.0.
  • Right click property and select properties in its menu.
  • Set the target framework as .NET 4.

Here comes to the explanation of the code:

Dynamically create Excel file and save it to stream

Firstly you can initiate an object of Spire.XLS.workbook

Workbook wbToStream= new Workbook();

Add Spire.XlS.Worksheet object by using the WorkSheet properties of Spire.XlS.Workbook. After that, write text in cell by take advantage of Range properties of Worksheet.

Worksheet sheet = wbFromStream.Worksheets[0];
sheet.Range["C10"].Text = "The sample demonstrates how to save an Excel workbook to stream.";

Then call the method SaveToStream of the Spire.XLS.Workbook object and save all the data which is in XLS format to stream.


Let’s preview the sample Excel:

save to stream

Load Excel file from stream in C#

You can initiate an object of Spire.Xls.Workbook

Workbook wbFromStream = new Workbook();

Load data which is in .xls format from steam by calling the method "LoadFromStream" of the Spire.XLS.Workbook object.


Save the object of Spire.XLS.Workbook as an .xls file.


Look at this screenshot:

save to stream

And what below is the full code used in the two functions:

static void Main(string[] args)
 //A: Dynamically create Excel file and save it to stream
 Workbook wbToStream= new Workbook();
 Worksheet sheet = wbToStream.Worksheets[0];
 sheet.Range["C10"].Text = "The sample demonstrates how to save an Excel workbook to stream.";
 FileStream file_stream = new FileStream("To_stream.xls", FileMode.Create);
//B. Load Excel file from stream
 Workbook wbFromStream = new Workbook();
 FileStream fileStream = File.OpenRead("sample.xls");
 fileStream.Seek(0, SeekOrigin.Begin);
Published in Document Operation
Wednesday, 08 February 2012 03:08

Create Excel File in C#, VB.NET

This section is designed to provide developers a simple solution on how to create Excel file in C#, VB.NET via this .NET Excel component Spire.XLS for .NET.

Spire.XLS for .NET allows you to create Excel file on the formats of Excel (.xls) 97-2003 and Excel (.xlsx) 2007 and Excel(.xlsx)2010 without installing MS Excel or any third party library. Apart from creating Excel file, this Excel api also enables you to read, edit and manipulate Excel files with high efficiency in .NET applications.

Below is the sample code for you to find how you can create an Excel file:

using System.Drawing;
using Spire.Xls;

namespace Create_Excel_File
    class Program
        static void Main(string[] args)
            //Initialize a new Workboook object
            Workbook workbook = new Workbook();
            //Get the first worksheet
            Worksheet sheet = workbook.Worksheets[0];
            //Write string values in a cell
            sheet.Range["A3"].Text = "This Excel Document is Created by Spire.XLS for .NET";
            //Save workbook to disk
            catch { }
Imports System.Drawing
Imports Spire.Xls

Namespace Create_Excel_File
	Class Program
		Private Shared Sub Main(args As String())
			'Initialize a new Workboook object
			Dim workbook As New Workbook()
			'Get the first worksheet
			Dim sheet As Worksheet = workbook.Worksheets(0)
			'Write string values in a cell
			sheet.Range("A3").Text = "This Excel Document is Created by Spire.XLS for .NET"
			'Save workbook to disk
			End Try
		End Sub
	End Class
End Namespace

The Created Excel File

After executing above code, The Excel file is created and some string values are also added in the first Worksheet”Sheet1”. Please see the screenshot below:

Create Excel File

Published in Document Operation