alvine :ok... what means by e.CommandArgument.ToString();
and this.GridView1.Rows[Convert.ToInt16(e.CommandArgument)]; ???
You can find a detail information at the following link below:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.commandeventargs.commandargument.aspx
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.rowcommand.aspx