Prevent duplicate MDI children forms

Question

Is there a way to prevent the opening of a certain form within an MDI container if that said form is already opened?

Answer 1

This code work for me in vb.net

 


For Each f As Form In Application.OpenForms
            If TypeOf f Is form_name Then
                f.Activate()
                f.WindowState = FormWindowState.Normal
                f.StartPosition = FormStartPosition.WindowsDefaultLocation
                f.WindowState = FormWindowState.Maximized

            Return
        End If    
    Next 
    form_name .MdiParent = Me
    form_name .Show()