How to stop the child windows child window to be disappeard?

Mayank Jani

Hii Members,

I am learning C# (2008) with Windows Application and I came to know about a difficulty during my experiments.

There is a parent window (MDI) and that contains many child windows. In a child window, there is a command button that opens a new form when clicked. The problem started when I use Alt+Tab to check something else...

Please see the screen shots... I have described in detail in the screenshots.

Dear Members, Please note that there is no error or bug in the form, they are working fine but, kindly try to understand my concern and give me solution of the same, if possible or, if there is a solution. Once again, I am using C# with MS VS 2008.

Thank You

Mayank Jani

10 Replies

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Mayank Jani8y ago
Hiii,
Please check the 'ParentChild.zip' to understand it more clearly. I have created a small WinApp for you and also added necessary comments.

Please reply if you find any answer.

Thank You.
0
Mayank Jani8y ago
Hiii,

any update, please? any solution, please?

Hii Amit & Yogesh,
I have attached the application sample. please run and check out.

Thanks
0
Mayank Jani8y ago
Hi Amit,
I've already tried this. Occures an error, 'Form that was specified to be the MdiParent for this form is not an MdiContainer. Parameter name: value' when assign the second form as MdiContainer (it becomes second container) another issue is, 'Form cannot be both an MDI child and MDI parent. Parameter name: value'

Hii Yogesh,
If I add ShowDialog() instead of Show(), Error - 'Form that is not a top-level form cannot be displayed as a modal dialog box. Remove the form from any parent form before calling showDialog.'

please check the attached file that I have added my code. please run and see yourself. all comments are added to the forms.
+1
Yogesh Ghorpade8y ago
private void languageToolStripMenuItem_Click(object sender, EventArgs e)
{
Form frmLanguage = new frmLanguage();
frmLanguage.ShowDialog();
}
+1
Amit Gupta8y ago
Why not put the code in between
Form frmGujLayout = new frmGujLayout();
frmGujLayout.MdiParent = this;
frmGujLayout.Show();
+1
Mayank Jani8y ago
Hii,

'http://csharp.net-informations.com/gui/cs-mdi-form.htm' is not woking for me.
+1
Mayank Jani8y ago
Hey...

this code is from the main MDI form (The Parent form)

private void languageToolStripMenuItem_Click(object sender, EventArgs e)
{
Form frmLanguage = new frmLanguage();
frmLanguage.MdiParent = this;
frmLanguage.Show();
}

the click on menu item will open the second window and it will be the child of the main form as mentioned in the code. clicking the button of the second window will open another form as mentioned in below code...

private void btnGujarati_Click(object sender, EventArgs e)
{
Form frmGujLayout = new frmGujLayout();
frmGujLayout.Show();
}

the opening frmGujLayout not minimizes in parent form. it goes to taskbar.

please ask if you found anything confusing...
+1
Amit Gupta8y ago
Have a look http://csharp.net-informations.com/gui/cs-mdi-form.htm
0
Mayank Jani8y ago
Hi Amit,
Thanks for reply...

on a button click of the child window, I write the code...

private void btnGujarati_Click(object sender, EventArgs e)
{
Form frmGujLayout = new frmGujLayout();
frmGujLayout.Show();
}

... that opens the third window. Ok? there is no option of ParentWindow, instead there is ParentForm which is not working.
Where should I mention parentwindow = this? because the third window will open only when use will click the button on 2nd (child of the parent) window.
+1
Amit Gupta8y ago
If you had set the parentwindow = this then the child windows will be under the parent form, whereas if you had set the form1.Show(); it will be a new window and will be minimized in windows taskbar rather than parent form
+1