asked on

Easy WinForm Question

Hello all,

I'm a asp.net guy not really a winform guy. I want to know something so simple it's stupid :)

I have two forms. form1 and form2

on form1 I have a button go to form2

when I click the button I do this:

this.Hide();
Form2 frm2 = new Form2();
frm2.Show();

and then we are now in form2.

on form2 I have a back button...

how can I get back to the first form...

obviously if I do this:

this.Hide();
Form1 frm1 = new Form1();
frm1.Show();

I will now have 2 form1 objects. (which I don't want.) and it will flush all the information that I put on Form1.

Any ideas how to do this?

Cebik

this.Hide();
Form2 nf = new Form2();
nf.ShowDialog();
 
this.Show();

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Cebik

ShowDialog - open form and wait to end..

zwei

form1Button.Click += new System.Eventhandler(form1Button_Click);
form2Button.Click += new System.Eventhandler(form2Button_Click);
 
form1Button_Click(object sender, Eventargs e)
{
    form1.Hide();
    form2.Show();
}
 
 
form2Button_Click(object sender, Eventargs e)
{
    form1.Show();
    form2.Hide();
}

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copyPasteGhost

ASKER

But for form 2 I want them to be able to go back to form1 and then if they want be able to go back to form2 again and still have everything there....like a previous/next kind of set up without loosing any information and without creating multiple objects.

copyPasteGhost

ASKER

@zwei

where do I put that?

Cebik

Try this then.
:)

public partial class Form1 : Form
{
    Form form2 = new Form();
 
    public Form1()
    {
        InitializeComponent();
 
        form2.FormClosing += new FormClosingEventHandler(nf_FormClosing);
    }
 
    private void button1_Click(object sender, EventArgs e)
    {
        this.Hide();
 
        form2.Show();
    }
 
    void nf_FormClosing(object sender, FormClosingEventArgs e)
    {
        e.Cancel = true;
        ((Form)sender).Hide();
        this.Show();
    }
}

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copyPasteGhost

ASKER

it's not really when form2 closes...it's when they click a back button..

how would I wire the event to the back button?

Cebik

When somebady try to close form2 then we not allowed to do that and we hide form2 and show main form.

Form form2 = new Form(); //use your Form2 form2 = new Form2();

Cebik

form2ButtonBack
.
Click
 
+=
 
new
 
System
.
Eventhandler
(
form2ButtonBack

_Click
);form2Button.Click += new System.Eventhandler(form2Button_Click);

or click 2 times on button in designer
and add code

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copyPasteGhost

ASKER

ok I see...

now what do we do with Form2? since when they click the back button I want them to go back to form1?

Cebik

wow..
what was that !!??

click 2 times on button in designer
and add code

or

form2ButtonBack.Click += new System.Eventhandler(form2ButtonBack_Click);form2Button.Click += new System.Eventhandler(form2Button_Click);

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Cebik

this
.
Show
();   //if we are in class FORM1
or
form1.Show();  //show form1... 

you cant do new form.. 
new Form1(..)
you must have acces to

form1.Show();

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copyPasteGhost

ASKER

right...that I knew...I mean here...In Form2...

private void btnBack_Click(object sender, EventArgs e) {
this.Hide();
this.Show();
}

ASKER CERTIFIED SOLUTION

Cebik

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Cebik

it's all in FORM1

in FORM2 do only

private void btnBack_Click(object sender, EventArgs e) {
this.Hide();
}

Cebik

i must go :/
i hope you got it

Cebik

sorry.. in your example make this
Form2 form2 = new Form2();

copyPasteGhost

ASKER

perfect thanks.

Cebik

public partial class Form1 : Form
{
    Form2 form2 = new Form2();
 
    public Form1()
    {
        InitializeComponent();
 
        form2.VisibleChanged += new EventHandler(form2_VisibleChanged);
    }
 
    void form2_VisibleChanged(object sender, EventArgs e)
    {
        //set visible of form1 to form2.Visible negation!
        this.Visible = !form2.Visible;
    }
 
    private void buttonShowForm2_Click(object sender, EventArgs e)
    {
        form2.Show();
    }
}

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zwei

In my example I meant something like this:

//Form2 class:
public partial class Form2 : Form
    {
        private Form1 form1;
        
        public Form2(Form1 form)
        {
            InitializeComponent();
            form1 = form;
        }
 
        private void backBtn_Click(object sender, EventArgs e)
        {
            form1.Show();
            this.Hide();
        }
    }
 
//Form1 class:
 public partial class Form1 : Form
    {
        private Form2 form2;
        
        public Form1()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();
            form2 = new Form2(this);
        }
 
        private void backBtn_Click(object sender, EventArgs e)
        {
            form2.Show();
            this.Hide();
        }
    }

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Cebik

ufff..
:)
youre welcome

Cebik

it will work too..