error when export datagrid view to excel sheet

Question

I Had data gridview in widows application and I added button to export data to excel sheet but these appeared

Cannot implicitly convert type \'object\' to \'Mic         


        

Answer 1

Don't forget to cast, as workbook.Sheets[] and workbook.ActiveSheet return object types:

worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Sheets["Sheet1"];
worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.ActiveSheet;

And your SaveAs method needs one addtional 'missing':

workbook.SaveAs("c:\\output.xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

As for the "Old format or invalid type library" error, see this Microsoft article for a workaround.