How to disable the parent form when a child form is active?

Question

How to disable a parent form when child form is active using c#?

Answer 1

For me this work for example here what happen is the main menu will be disabled when you open the registration form.

 frmUserRegistration frmMainMenu = new frmUserRegistration();
    frmMainMenu.ShowDialog(this);

Answer 2

Have you tried using Form.ShowDialog() instead of Form.Show()?

ShowDialog shows your window as modal, which means you cannot interact with the parent form until it closes.

Answer 3

Why not just have the parent wait for the child to close. This is more than you need.

// Execute child process
System.Diagnostics.Process proc = 
    System.Diagnostics.Process.Start("notepad.exe");
proc.WaitForExit();

Answer 4

Its simple, use

  Form.ShowDialog();

Instead

  Form.Show();

While using Form.ShowDialog()you cannot interact with the parent form until it closes.

Answer 5

You can also use MDIParent-child form. Set the child form's parent as MDI Parent

Eg

child.MdiParent = parentForm;
child.Show();

In this case just 1 form will be shown and the child forms will come inside the parent. Hope this helps

Answer 6

You can do that with the following:

Form3 formshow = new Form3();

formshow.ShowDialog();