private void UpdatePort(string id) { string portName; TextBox txtPortName = (TextBox)this.FV_Port.FindControl("txtPortName"); portName = (txtPortName == null) ? "" : (string.IsNullOrEmpty(txtPortName.Text) ? "" : txtPortName.Text); Port port = new Port(); port.DoUpdate(id, portName); BindList(); this.lblMessage.Text = "Update successfully"; this.lblMessage.ForeColor = Color.Green; }