public void grdDrawingList_DeleteCommand(object sender, DataGridCommandEventArgs e)
{
String DetailId = "";
DetailId = grdDrawingList.DataKeys[Convert.ToInt32(e.Item.ItemIndex)].ToString();
contingency _wc = new contingency();
_wc.DeleteDrawingList(Convert.ToInt32(DetailId));
BindDrawingList(Convert.ToInt32(ViewState["EstNum"].ToString()));
}