How to close a Form from a Form in C#?

Question

I have 3 Forms. From Form1 I open Form3 and Form4 with a button. But than when I press a Button on Form4 I want to close both Form4 and Form3.(Don't worry about Form2)

Form1:

private void button1_Click(object sender, EventArgs e)
    {

        Form3 frm3 = new Form3();
        frm3.Show();

        Form4 frm4 = new Form4();
        frm4.Show();



    }

Form4:

private void button12_Click(object sender, EventArgs e){
    this.Close();
    //Plus close Form3

Iterate over the `Application.OpenForms` collection and close the forms you want to close. — jac, Jan 10 '18 at 23:22

user3532232 · Accepted Answer · 2018-01-10T23:35:28.400

0

Form1:

private void button1_Click(object sender, EventArgs e) { 
   Form3 frm3 = new Form3();
   frm3.Show(); 

   Form4 frm4 = new Form4(frm3);
   frm4.Show();
 }

Form4:

Form3 mFrm3Ref;
public Form4(Form3 frm){
    mFrm3Ref = frm;
    //and other initializing stuff 
} 
private void button12_Click(object sender, EventArgs e){
   mFrm3Ref.Close() ;
   this.Close();
}

edited Jan 10 '18 at 23:35

answered Jan 10 '18 at 23:07

user3532232

257
8
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It doesn't recognize mFrm3Ref.Close(); – Márton Gergő Jan 10 '18 at 23:11
@MártonGergő updated my answer – user3532232 Jan 10 '18 at 23:17
It has a problem now at #Form4 frm4 = new Form4# There is no argument given that corresponds to the required formal parameter 'frm' of 'Form4.Form4(Form3)' – Márton Gergő Jan 10 '18 at 23:31
@MártonGergő my bad edited the post. – user3532232 Jan 10 '18 at 23:36

How to close a Form from a Form in C#?

1 Answers1