Visual Studio 2008 window form closes immediately after opening

Question

Within my Visual Studio 2008 VB.Net project I am opening multiple forms after setting the form (that is opening) to be an mdichild of the main form. This works in really well in most of my forms except one. I am doing the exact same thing for all of them.

Basically I declare the new form:

Using frm As New frmName() With {.variableName = currentVariable}
  frm.MdiParent = Me.MdiParent
  frm.openForm()
End Using

Within the openForm subroutine in the form code I have:

Public Sub openForm()
  InitializeDataSources()
  ...   ...
  Me.Show()
End Sub

I know this works because if I remove frm.MdiParent = Me.MdiParent in the main form and change Me.Show() to Me.ShowDialog() in the child form then it works perfectly. Right now (for only one form) it shows the form for only a second (looks like a flicker when staring at the program) and then closes it.

What should I do to fix this?

Answer 1

Don't know what USING is for in VB, but in C# it is disposing the object created by the statement when the execution exists the block. If the purpose is the same, then this is the answer: you are creating the form:

Using frm As New frmName()

then you show it but when

End Using

is executed your form will be disposed, that is, closed.