c# - How do I store Excel File without getting the warning -

i trying replace file gives me warning:

the file exists. want replace file

in code, not want warning

code:

    string fromfile = @"\\test.net\excel\123.xls";     string tofile = @"\\test.net\excel\123.xls";      microsoft.office.interop.excel.application app = new microsoft.office.interop.excel.application();     microsoft.office.interop.excel.workbook wb = app.workbooks.open(fromfile, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing, type.missing);      file.delete(tofile);      wb.saveas(tofile, microsoft.office.interop.excel.xlfileformat.xlworkbookdefault, type.missing, type.missing, false, false, microsoft.office.interop.excel.xlsaveasaccessmode.xlexclusive, microsoft.office.interop.excel.xlsaveconflictresolution.xllocalsessionchanges, false, type.missing, type.missing, type.missing);     wb.close(false, type.missing, type.missing);          app.quit(); 

add

app.displayalerts = false; 

before saveas call , add

app.displayalerts = true; 

after close event.