How to close the parent window of a Child Window

It is actually a problem of inter-window communication.

Implementation Method:

Declare the event in the subwindow:

Public event childclose closefather;

Then trigger this event in its close event:

Private void formpolicclosed (object sender, System. EventArgs e)
{
// Use events to close the main window
Closefather ();
}

In the parent window (in the login window ):

Before the window class, declare the proxy after the common namespace:

Public delegate void childclose ();

Then, the subform is written as follows:

Form1 ff = new Form1 ();
Ff. closefather + = new childclose (this. closethis); // closethis () is a method in the parent form
Ff. Show ();

Definition method:

Public void closethis ()
{
This. Close ();
}

Complete!