隐藏GridView过长的数据

 for (int j = 1; j < Gv_FAQ.Columns.Count; j++)
            {
                for (int i = 0; i < Gv_FAQ.Rows.Count; i++)
                {
                    Gv_FAQ.Rows[i].Cells[j].ToolTip = Gv_FAQ.Rows[i].Cells[j].Text;
                    //长度过八个字符的时候隐藏显示
                    if (Gv_FAQ.Rows[i].Cells[j].Text.Length > 20)
                    {
                        Gv_FAQ.Rows[i].Cells[j].Text = Gv_FAQ.Rows[i].Cells[j].Text.Substring(0, 20) + "...";
                    }
                }
            }