GridControl 无数据时显示信息

图例：

主要代码如下：

说明：给GridView添加事件gv_CustomDrawEmptyForeground

  private void gv_CustomDrawEmptyForeground(object sender, DevExpress.XtraGrid.Views.Base.CustomDrawEventArgs e)
        {
            int num = 100;
            if (DSMain.Tables[0].Rows.Count < 1) {
                string str = "没有找到你要查询的数据！";
                Font f = new Font("华文中宋", 10, FontStyle.Regular);
                Rectangle rec = new Rectangle(e.Bounds.Top + num, e.Bounds.Left + num, e.Bounds.Right - num, e.Bounds.Bottom - num);
                e.Graphics.DrawString(str, f, Brushes.Black, rec);
            }
        }