Getting first row only in normal mode in gridview in asp.net?

HI all,
Hope doing well,
Sir i am using one gridview with item template of textbox and i have one dropdownlist. now when i select value in dropdown based on that value is populating in gridview.
but i want that data should show in gridview in edit mode for that i have written code in rowdatabound event in gridview as given below:
 protected void GridService_RowDataBound(object sender, GridViewRowEventArgs e)         {             if (e.Row.RowType == DataControlRowType.DataRow)             {                 ImageButton ImgUpdate = (ImageButton)e.Row.FindControl("ImgUpdate");                 ImageButton ImgCancel = (Image ...