How to export Excel data to CSV file in WinForms?

Syncfusion Essential® XlsIO is a .NET Excel library used to create, read, and edit Excel documents. Using this library, you can export an Excel file with data into a CSV file.

Steps to export Excel data into a CSV file programmatically:

1. Create a new C# console application project.

Create a new console application

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

Install XlsIO NuGet package

3. Include the following namespace in the Program.cs file.

C#

using Syncfusion.XlsIO;

VB.NET

Imports Syncfusion.XlsIO

4. Use the following code snippet to export an Excel file with data into CSV file.

C#

// Initialize ExcelEngine
using (ExcelEngine excelEngine = new ExcelEngine())
{
    // Initialize Application
    IApplication application = excelEngine.Excel;
 
    // Set default version for application
    application.DefaultVersion = ExcelVersion.Xlsx;
 
    // Open a workbook to be exported as CSV
    IWorkbook workbook = application.Workbooks.Open(DataPathBase + "ExportData.xlsx");
 
    // Accessing the first worksheet in the workbook
    IWorksheet worksheet = workbook.Worksheets[0];
 
    // Save the workbook to csv format
    worksheet.SaveAs("Output.csv", ",");
}

VB.NET

'Initialize ExcelEngine
Using excelEngine As ExcelEngine = New ExcelEngine
 
    'Initialize Application
    Dim application As IApplication = excelEngine.Excel
 
    'Set default version for application
    application.DefaultVersion = ExcelVersion.Xlsx
 
    'Open a workbook to be exported as CSV
    Dim workbook As IWorkbook = application.Workbooks.Open((DataPathBase + "ExportData.xlsx"))
 
    'Accessing first worksheet in the workbook
    Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
    'Save the workbook to csv format
    worksheet.SaveAs("Output.csv", ",")
 
End Using

A complete working example to export Excel data to CSV can be downloaded from Export-Excel-File-To-CSV-File.zip.

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

Excel to CSV

CSV file with comma separated output is as below,

CSV 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 PivotTables, appending multiple records to worksheet using Template Markers, and most importantly PDF and Image conversions etc., with code examples.

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

An online sample link to export Excel file to CSV file.