C# Excel Interop: How to format cells to store values as text

Question

I\'m writing numbers to an Excel spreadsheet from a DataTable and all of these numbers are 5 digits long with preceding 0s if the number itself is less than 5 digit

Answer 1

//where [1] is column number which you want to make text

ExcelWorksheet.Columns[1].NumberFormat = "@";

//If you want to format a particular column in all sheets in a workbook - use below code. Remove loop for single sheet along with slight changes.

//path were excel file is kept

string ResultsFilePath = @"C:\Users\krakhil\Desktop\TGUW EXCEL\TEST";

    Excel.Application ExcelApp = new Excel.Application();
    Excel.Workbook ExcelWorkbook = ExcelApp.Workbooks.Open(ResultsFilePath);
    ExcelApp.Visible = true;

    //Looping through all available sheets
    foreach (Excel.Worksheet ExcelWorksheet in ExcelWorkbook.Sheets)
    {                
        //Selecting the worksheet where we want to perform action
        ExcelWorksheet.Select(Type.Missing);
        ExcelWorksheet.Columns[1].NumberFormat = "@";
    }

    //saving excel file using Interop
    ExcelWorkbook.Save();

    //closing file and releasing resources
    ExcelWorkbook.Close(Type.Missing, Type.Missing, Type.Missing);
    Marshal.FinalReleaseComObject(ExcelWorkbook);
    ExcelApp.Quit();
    Marshal.FinalReleaseComObject(ExcelApp);