VB .net MDI Form question

Hi guys,

I am trying to determine whether the child form is opened before creating another instance of a form.


The following code creates a new instance of form.


Dim frm As New Form
frm.MdiParent = Me ' Me is the container
frm.Show()


I don't want to create another instance of a form if the same form already opened. If the form already opened then I want to bring to the front.

Thanks in advance

The way I do it is if I want to only have 1 instance of a form on a screen at any one time is to declare a private reference to the form inside the MDI parent, and just use that.

e.g.

VB Code:

'At form declarations
Private m_Child As frmChild
 
'Later on inside a click event
If m_Child Is Nothing Then
            m_Child = New frmChild
ElseIf m_Child.Created = False Then
           'Form has been disposed, need to create a new instance
            m_Child = New frmChild
End If
m_Child.MdiParent = Me
m_Child.Show()
m_Child.Activate()