Gridview的tooltip功能

 protected void GridViewEx_RowDataBound(object sender, GridViewRowEventArgs e)
 {
     if (e.Row.RowType == DataControlRowType.DataRow)
     {
        if (e.Row.Cells[8].Text.Length > 35)
        {
           e.Row.Cells[8].ToolTip = e.Row.Cells[8].Text;
           e.Row.Cells[8].Text = e.Row.Cells[8].Text.Substring(0, 35) + "...";
        }
    }
 }