EasyXLS

How to export data to XLSX file in C#.NET

/* ----------------------------------------------------------------
 * Tutorial 28
 * 
 * This tutorial shows how to export data to XLSX file that has
 * multiple sheets in C#. The first sheet is filled with data.
 * ----------------------------------------------------------------- */
Click here to see the Excel file

using System;
using EasyXLS;
using EasyXLS.Constants;

public class Tutorial28
{
    [STAThread]
    static void Main()
    {
        Console.WriteLine("Tutorial 28\n----------\n");

        // Create an instance of the class that exports Excel files, having two sheets
        ExcelDocument workbook = new ExcelDocument(2);
    
        // Set the sheet names
        workbook.easy_getSheetAt(0).setSheetName("First tab");
        workbook.easy_getSheetAt(1).setSheetName("Second tab");

        // Get the table of data for the first worksheet
        ExcelTable xlsFirstTable = ((ExcelWorksheet)workbook.easy_getSheetAt(0)).easy_getExcelTable();

        // Add data in cells for report header
        for (int column=0; column<5; column++)
        {
            xlsFirstTable.easy_getCell(0,column).setValue("Column " + (column + 1)); 
            xlsFirstTable.easy_getCell(0,column).setDataType(DataType.STRING);
        }

        // Add data in cells for report values
        for (int row=0; row<100; row++)
        {
            for (int column=0; column<5; column++)
            {
                xlsFirstTable.easy_getCell(row+1,column).setValue("Data " + (row + 1) + ", " + (column + 1)); 
                xlsFirstTable.easy_getCell(row+1,column).setDataType(DataType.STRING);
            }
        }

        // Set column widths
        xlsFirstTable.setColumnWidth(0, 70);
        xlsFirstTable.setColumnWidth(1, 100);
        xlsFirstTable.setColumnWidth(2, 70);
        xlsFirstTable.setColumnWidth(3, 100);
        xlsFirstTable.setColumnWidth(4, 70);

        // Export the XLSX file
        Console.WriteLine("Writing file C:\\Samples\\Tutorial28.xlsx.");
        workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial28.xlsx");

        // Confirm export of Excel file
        String sError = workbook.easy_getError();
        if (sError.Equals(""))
            Console.Write("\nFile successfully created. Press Enter to Exit...");
        else
            Console.Write("\nError encountered: " + sError + "\nPress Enter to Exit...");

        // Dispose memory
        workbook.Dispose();

        Console.ReadLine();
    }
}

EasyXLS Excel libraries:

.NET
Excel Library for C#
full .NET version to import, export or convert Excel files
Excel Writer for C#
.NET version to create and export Excel files
Download EasyXLS™ Excel Library for C#

File formats:

MS Excel 97 - 2003
MS Excel 2007 - 2010
MS Excel 2013
MS Excel 2016
MS Excel 2019
XLSX XLSM XLSB XLS
XML HTML CSV TXT