Check if form is Opened

Question

I give this question for more knowledge. How can I know if the form is Opened in my application or not, in order not to open it again I mean not to create an instance of the

Answer 1

As an extension of the answers given (thank you, all), here's a simple way to activate or show:

Dim frmCollection = System.Windows.Forms.Application.OpenForms
If frmCollection.OfType(Of Form2).Any Then
    frmCollection.Item("Form2").Activate()
Else
    Dim newForm2 = New Form2
    newForm2.Show()
End If