protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
{
   if (e.Row.RowType == DataControlRowType.DataRow)
 {
   e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor='Silver'");
   e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor='green'");
  } 
}