overwrite excel file without popup in C#

Question

The following piece of code to save an excel file still throws a pop up box asking if I should overwrite the existing file. How can I auto overwrite the existing file without the popup being thrown?

xlWorkBook.SaveAs(@"C:\Temp\csharp-Excel.xls"
                                  , XlFileFormat.xlWorkbookNormal
                                  , misValue
                                  , misValue
                                  , misValue
                                  , misValue
                                  , XlSaveAsAccessMode.xlExclusive
                                  , XlSaveConflictResolution.xlLocalSessionChanges
                                  , misValue
                                  , misValue
                                  , misValue
                                  , misValue);

Answer 1

You can turn off the DisplayAlerts property on the application object. For example:

Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
excel.DisplayAlerts = false;

As @Degustaf has pointed out: It is important to run excel.DisplayAlerts = True after your SaveAs code runs.

Also, you can use System.IO.File.Exist() to check if that file exists and then just delete it with File.Delete.

For example:

var fileName = @"C:\Temp\csharp-Excel.xls";
if (File.Exists(fileName)) File.Delete(fileName);

This will ensure that there is no file of the same name, so you can overwrite it without a prompt.