I'm simply trying to edit a spreadsheet that has text already written into to change the text to be blank. However its not working. the method seems to do nothing. my code is:

public static void ClearCells(string SpreadsheetFilePath)
{

    var SpreadsheetPath = new FileInfo(SpreadsheetFilePath);
    var package = new ExcelPackage(SpreadsheetPath);
    ExcelWorkbook workBook = package.Workbook;
    if (workBook != null)
    {
        if (workBook.Worksheets.Count > 0)
        {
            ExcelWorksheet currentWorksheet = workBook.Worksheets.First();
            currentWorksheet.SetValue(1, 1, "hello123");
        }
    }
}

There is no runtime error. It runs, completes and the spreadsheet is unchanged. I don't know why.