Add Worksheet to a Workbook in C#

add-worksheet-to-workbook.cs

string filePath = "/path/to/existing/spreadsheet.xlsx";  // Replace with the path to your file

// Open the existing workbook.
using (var workbook = new Workbook(filePath))
{
    // Add a new worksheet to the workbook.
    Worksheet newSheet = workbook.AddSheet("NewWorksheetName"); // Replace 'NewWorksheetName' with the desired name

    // You can also add some content to the new worksheet if needed.
    Cell cellA1 = newSheet.Cells["A1"];
    cellA1.PutValue("Hello from the new sheet!");

    // Save the workbook with the added worksheet.
    workbook.Save();
}