How to close two forms at the same time? C# Window Form?

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How to close two forms at the same time? C# Window Form?
i have 3 forms open. but i only want to close 2,, i tried using first i call the 2nd form that i want to be closed

C#

form1 f = new form1(); //this will call the 2nd form
this.close(); //this will close the current form
f.show(); //this will show the 2nd form
f.close(); //this will close the 2nd form

but the 2nd form that i wanted to be close is still open.

Posted 19-Jul-12 7:40am

cloud_garcia

Updated 27-Jul-20 6:04am

Rahul Rajat Singh

v5

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N_tro_P · Answer 1 · 2012-07-19T07:51:00

You need to close that form from itself or an object that has access to it.

What object opened these forms? It can listen to the event you want and close the all the forms that need be.

e.g.

C#

partial class Form1 : Form
{
   Form2 _form2;
   Form3 _form3;
   private void MakeForms()
   {
      _form2 = new Form2();
      _form2.SomeEvent += HandleSomeEvent;

      _form3 = new Form3();
   }

   private void HandleSomeEvent(object sender, EventArgs args)
   (
      _form2.Close();
      _form3.Close();
   )
}

...
//Other file
partial class Form2 : Form
{
   public event EventHandler SomeEvent;

   //Call this method when you want to close the forms
   private void RaiseSomeEvent()
   {
      var handler = SomeEvent;
      if(SomeEvent != null)
          SomeEvent(this, EventArgs.Empty);
   }
}
...
//Other File
partial class Form3 : Form
{
}

Kschuler · Answer 2 · 2012-07-19T07:51:00

What event is triggering the close of the two windows?

This.Close() will only close the form on which the code is written. That's what the "This" part of it means. So if you have a button on Form3 named btnExecute and you want it to close Form1 and Form2, you would have to do something like this: (it's in vb.net, but you should easily be able to convert it)

VB

Private Sub btnExecute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExecute.Click
    Form1.Close()
    Form2.Close()
End Sub

UPDATE - It's really easy to switch from VB.Net to C#....here is the C#:

C#

private void btnExecute_Click(object sender, System.EventArgs e)
{
   Form1.Close();
   Form2.Close();
}

Member 14900177 · Answer 3 · 2020-07-27T06:04:00

in case you are using nested form (form within form) for example login form within Form1 we can pass the Form1 object to loginpage form constructor as,
file: Form1.cs
private void iconButton1_Click(object sender, EventArgs e)
{
OpenChildForm(new loginpage(this));
}

private void OpenChildForm(Form ChildForm)//refered from rjcode
{
if(CurrentChildForm != null)
{
CurrentChildForm.Close();
}
CurrentChildForm = ChildForm;
CurrentChildForm.TopLevel = false;
CurrentChildForm.FormBorderStyle = FormBorderStyle.None;
CurrentChildForm.Dock = DockStyle.Fill;
panel2.Controls.Add(CurrentChildForm);
panel2.Tag = CurrentChildForm;
CurrentChildForm.BringToFront();
CurrentChildForm.Show();
}

file: loginpage.cs
Form1 mainform;
public loginpage(Form1 main)
{
InitializeComponent();
mainform = main;
}
private void button1_Click(object sender, EventArgs e)
{
MainPage nextForm = new MainPage();
mainform.Hide();
nextForm.ShowDialog();
mainform.Close();
}

kuldeepkumartak · Answer 4 · 2012-07-19T08:02:00

Solution 4

when you show your page when make object then
form f1=new form();
this.hide();
f1.showdialog();
this.close();
i think it is helpful for you

Posted 19-Jul-12 8:02am

kuldeepkumartak

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cloud_garcia 19-Jul-12 21:19pm

i already try this but the 2nd form is still open

How to close two forms at the same time? C# Window Form?

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