Call a Form from MDI Window? [Resolved]

[albertlse]

How can i call a Form from a MDI Window?

How can i set a Form as a child of a MDI Window?

"Form1.Show" works in VB 6.0, now does not work in VB .NET.

Any solution VB .NET to show a Form?

Please guide. 10q!

[Pirate]

To show a form do this :

dim myform as new yourform 
myform.show

[Pirate]

To create new child form just call this little sub .

Private Sub NewChild()
        Dim fc As New YourChildform()
        fc.MdiParent = Me
        fc.Show()
    End Sub

[albertlse]

In my case, I try to open Form1 from mdiForm.

This is how i wrote in mdiForm:

Private Sub mnuFileNew_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFileNew.Click
Dim frmNewEntry As frmEntry

frmNewEntry.Show()
End Sub

Is this correct?

But why the error message below keep on occur?
"System.NullReferenceException: Object reference not set to an instance of an object."

Please guide. Thank you.

[Pirate]

Originally posted by albertlse

This is how i wrote in mdiForm:

Private Sub mnuFileNew_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFileNew.Click
Dim frmNewEntry As frmEntry

frmNewEntry.Show()
End Sub

You need to create new(instaciate) object of frmEntry by using New keyword. You have to read more about OOP in .NET . So your code should look like so :

Private Sub mnuFileNew_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFileNew.Click
Dim frmNewEntry As New frmEntry
 
    frmNewEntry.Show()
End Sub

[VBCrazyCoder]

"System.NullReferenceException: Object reference not set to an instance of an object." is usually an indication that you did not use the "New" keyword to instantiate the object prior trying to use it.

[albertlse]

It's working fine now! Thank you!