How to Save/Overwrite existing Excel file with Excel Interop - C#

Question

Is there a way to save changes to an excel spreadsheet through the excel interop (in this case I am adding a worksheet to it) without having it prompt the user if they want to overwrite the existing file with the changes. I do not want the user to even see the spreadsheet open in my application so having a message box popping up asking them if they want to overwrite the file seems very out of place and possibly confusing to the user.

I am using the workbook.SaveAs(fileloaction) method.

Here is where I am initializing the COM reference objects for the excel interop.

private Excel.Application app = null;
    private Excel.Workbook workbook = null;

    public Excel.Workbook Workbook
    {
        get { return workbook; }
        set { workbook = value; }
    }
    private Excel.Worksheet worksheet = null;
    private Excel.Range workSheet_range = null;

Below is the code I am using to close/save the excel file. The workbook.close() method line is the one that is reportedly throwing the unhandled exception.

 workbook.Close(true, startForm.excelFileLocation, Missing.Value);
            Marshal.ReleaseComObject(app);
            app = null;
            System.GC.Collect();

Answer 1

Basically, all you need is ExcelApp.DisplayAlerts = False - Here's how I do it, though:

ExcelApp.DisplayAlerts = False
ExcelWorkbook.Close(SaveChanges:=True, Filename:=CurDir & FileToSave)

Hope this helps