WinForms Wait Form - How to cancel a time-consuming operation

This example shows how to close the Wait Form to cancel a time-consuming operation:

• Add a GridControl onto the Form.

• Place a BackgroundWorker component onto the Form and handle its RunWorkerCompleted and DoWork events.

• Place a SplashScreenManager component onto the Form.

• Invoke the SplashScreen Manager's smart tag menu and add a Wait Form.

• Add a Load Data button onto the Form and handle its Click event to load data and display a wait form.

  private void simpleButton1_Click(object sender, EventArgs e) {
      Person.counter = 0;
      backgroundWorker1.RunWorkerAsync(locker1);
  
      splashScreenManager1.ShowWaitForm();
      splashScreenManager1.SendCommand(WaitForm1.WaitFormCommand.SendObject, locker1);
  }

• Open the WaitForm designer and add a Cancel button.

• Handle the Cancel button's Click event to cancel the operation:

  private void simpleButton1_Click(object sender, EventArgs e) {
      if (locker != null)
          ((ILocked)locker).IsCanceled = true;
  }

Files to Review

• WaitForm1.cs (VB: WaitForm1.vb)
• Form1.cs (VB: Form1.vb)
• ILocked.cs (VB: ILocked.vb)
• Locker.cs (VB: Locker.vb)

Documentation

• WinForms Splash Screen Manager
• Wait Form

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