change the text on the form control button in Excel using C#

hi,

how to change the text on the form control button in Excel which i created using the below code.
am unable to view the change of name of button in Excel sheet ..code i used to create button is

XlFormControl button = (Excel.XlFormControl)0;
Excel.Shape btnPrint17 = ExcelWorksheet.Shapes.AddFormControl(button, 300, 200, 60, 22);
btnPrint17.Name="Insert";