private void btnDelSrv_Click(object sender, EventArgs e)
        {
            try
            {
                if (GVTableDelSrv.RowCount > 0)
                {
                    var db = new linqDataContext();
                    db.DelSrvman(Convert.ToInt32(GVTableDelSrv.CurrentRow.Cells[0].Value));
                    GVTableDelSrv.DataSource = db.ShowSrvman();
                }
            }

            catch (System.Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);
            }
        }