[RESOLVED] Opening MDI Child forms

[parthamaj]

Dear Sir/Madam,

In a MDI application, for opening a form in the MDI, I am using the following code

    Private Sub RoleToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RoleToolStripMenuItem.Click
        Dim lobj_ChildForm As frmRole

        'Check if form is already open
        lobj_ChildForm = Nothing
        For Each lobj_OpenForm In Me.MdiChildren()
            If lobj_OpenForm.Name = frmRole.Name Then
                lobj_ChildForm = lobj_OpenForm
            End If
        Next

        If Not (lobj_ChildForm Is Nothing) Then
            lobj_ChildForm.BringToFront()
        Else
            lobj_ChildForm = New frmRole
            lobj_ChildForm.MdiParent = Me
            lobj_ChildForm.Show()
        End If
    End Sub

As you can see, I need loopong through all the open child forms. Is this the only way? Or is there a better technique?

Regards,
Partha

[jmcilhinney]

It appears that you only want one instance of frmRole open at a time. This is one situation where I would genuinely support using a default instance. Your code should simple be:

frmRole.MdiParent = Me
frmRole.Show()
frmRole.Activate()

That will handle all three possible situations, i.e. no instance has ever been displayed, an instance is currently displayed and an instance has been displayed but has been closed.

For more information on default instances, follow the Blog link in my signature and check out my post on the subject.

[parthamaj]

Thanks