show form

Elham M

What's the different between 2 code below? 1-Form2 obj1=new Form2(); obj1.show(); 2-Form2 obj2=new Form2(); obj2.showDialog(); :doh:

Pete OHanlon

One shows a dialog (i.e. a modal window), the other shows a modeless window.

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Paladin2000

Well, showdialog() causes the form to be show as a "dialog" (hence the name). That means that it will retain focus in your application: you will notice that you can't place the focus on the calling form while the dialog remains active/visible. Make sense?

freshonlineMax

In obj2.show you can move form everywhere but in another case it can move in the parent form area. I guess.. :|

Pete OHanlon

freshonlineMax wrote:

n obj2.show you can move form everywhere but in another case it can move in the parent form area. I guess.. :|

You guess wrong. The second example just shows a dialog box. There's no constraint in where it can be moved - the constraint is in how you can interact with the hosting application. As it's modal, processing on the primary thread halts in the calling code until it is dismissed.

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_Erik_

As an addition to what others have told you, the Form object must be disposed later if you show it with ShowDialog method, so in this case it is much better to do this:

using (Form2 obj2 = new Form2())
{
obj2.ShowDialog();
}

DaveyM69

An additional addition to the previous good answers... ShowDialog returns a value of type DialogResult that enables you to determine the result of whatever that form was shown for - useful for custom message box type dialogs etc.

Dave
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Lost User

Yes Both are using for showing Form. But Firt one is used for showing form as a normal form. But Second One Is Used for Showing Form as a Dialog. You can not access Normally from Mouse or Keyboard. First Case shows Non Immediate Value Required. Second Shows Must Value Required. Best Regard

If you can think then I Can.

Elham M

so you mean that with showdialog I can access the component in form2 like textbox? what can I do with dialog?

Paladin2000

You need to make an accessor to expose the items you need from the form. Here is an example: I created a project with two forms. Form1 (parent/main) contains a textbox and a button. Form2 (dialog) has a textbox and two buttons (OK and Cancel). In the properties of the buttons, I set the "DialogResult" to "OK" and "Cancel" respectively, then in Form2's properties, set the AcceptButton to the OK button, and the CancelButton to the Cancel button. From there, the code is simple:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1\_Click(object sender, EventArgs e)
    {
        Form2 frm = new Form2();
        if (frm.ShowDialog() == DialogResult.Cancel) return;  //Cancel was chosen, so do nothing else
        textBox1.Text = frm.Value;
    }
}

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
    }

    /// <summary>
    /// Makes the value of the textbox accessible.
    /// </summary>
    public string Value
    {
        get { return textBox1.Text; }
    }
}

Elham M

Thanks you realy help me.:rose::thumbsup: