Question

How can I close a different WinForm (B) from a different WinForm’s (A) code?

I already have it set up so WinForm (B) gets opened in WinForm (A)’s code:

Form2 form2 = new Form2();
form2.ShowDialog();

Answer 1

You need to make two changes to your code:

• Use Show instead of ShowDialog so that the first window can still handle events.
• Keep a reference to the form you opened.

Here’s some example code:

Form2 form2;

private void button1_Click(object sender, EventArgs e)
{
    form2 = new Form2();
    form2.Show();
}

private void button2_Click(object sender, EventArgs e)
{
    form2.Close();
}

You will need to add some logic to make sure that you can’t close a form before you have opened it, and that you don’t try to close a form that you’ve already closed.