c# - How to access a control within a Gridview inside of a FormView -


i have gridview within formview. trying loop through gridview comparison receive following error: "object reference not set instance of object." have tried different things find control within gridview nothing seems work. below code code behind:

gridview mygridview = (gridview)frmpvdryr.row.findcontrol("grdpvdryr");  foreach (gridviewrow row in mygridview.rows) //prevents duplicate entries being entered table {     if (row.rowtype == datacontrolrowtype.datarow)     {         textbox start_dt = row.findcontrol("txtstartdt") textbox;         if (start_dt.text == ((textbox)frmpvdryr.row.findcontrol("txtstartdt")).text || ((textbox)row.findcontrol("txtenddt")).text == ((textbox)frmpvdryr.row.findcontrol("txtenddt")).text)         {             ((textbox)frmpvdryr.row.findcontrol("txtstartdt")).text = string.empty;             ((textbox)frmpvdryr.row.findcontrol("txtenddt")).text = string.empty;              clientscript.registerstartupscript(this.gettype(), "dateerror", "<script language='javascript'>alert('please enter valid start and/or end date.');</script>");             return;         }     } }

can please help? not sure else try @ point.


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