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How to write data to an existing Excel file in C#, VB.NET

Syncfusion Essential XlsIO is a .NET Excel library used to create, read, and edit Excel documents. Using this library, you can write data into an existing Excel worksheet in C# and VB.NET.

 

Steps to write data into an Excel file programmatically:

 

  1. Create a new C# console application project.

 

Create Console application in Visual Studio

 

  1. Install Syncfusion.XlsIO.WinForms NuGet package as a reference to your .NET Framework applications from the NuGet.org.

 

Add XlsIO reference to the project

 

  1. Include the following namespaces in the Program.cs file.

 

 

 

  1. Add the following code snippet to write data into an existing Excel file.

 

 

 

A complete working example to write data to an existing Excel file along with input file used can be downloaded from Write-Data-to-Existing-Excel-file.zip

 

By executing the program, you will get the Excel file as follows.

 

Write Data to Existing Excel File

 

Take a moment to peruse the documentation, where you can find basic worksheet data manipulation options along with features like Conditional Formatting, worksheet calculations through Formulas, adding Charts in worksheet or workbook, organizing and analyzing data through Tables and Pivot Tables, appending multiple records to worksheet using Template Markers, and most importantly PDF and Image conversions with code examples.

 

Refer here to explore the rich set of Syncfusion Essential XlsIO features.

 

An online sample link to generate Excel file.

 

Note:

Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.

Article ID: Published Date: Last Revised Date: Platform: Control:
9107 08/06/2018 10/15/2018 Windows Forms XlsIO
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