Sub Main()

[vsusi]

Public Sub Main()
Dim frm As New frmMDI
frm.Show()
End Sub
I used the above code in module.

In VB it opens the MDI and stays.
In .Net it doesn't open and stay. Application terminates immediately after doing some process.

Pls help.

[Edneeis]

Yes Show doesn't hold the thread open you can either use ShowDialog or Application.Run(New frmMDI).

[vsusi]

Thanks. It worked.

How do I restrict a form to be opened multiple times.

[Edneeis]

'Restrict it to open multiple times', What do you mean?

[vsusi]

Dim frm As New Form1
frm.MdiParent = Me
frm.Show()

If I use the above, it opens the form every time I call. But I want it to check whether the form is already open.

I don't want multiple instances of same Form.

[VBCrazyCoder]

Do you mean restrict a form to only one instance?

[vsusi]

Yes

[Edneeis]

Single instance of your app or just that form?

If you mean form then this should get you started: http://www.vbforums.com/showthread.p...hreadid=126418

[VBCrazyCoder]

Then you could do something like create the for variable a global (dim myFrm as Form1) and then before you create it when needed, you can check to see if myFrm = Nothing. If it is then go ahead and create the one instance. If <> Nothing then either close it and re-open it, do nothing, or set focus to the instance already in existence.

Dim myFrm As Form1 'Make this a class variable
 
If myFrm Is Nothing Then
     'No instance of the form yet
     myFrm = New Form1
     myFrm.Show() 'or show dialog
Else
     'Instance already exists so take appropriate action here
End If

[VBCrazyCoder]

Oh, MDI - the link posted by Edneeis will be of more use then

[vsusi]

Cool. It works.