[2005] How to prevent multiple instances of the form

[jsc0624]

Hi to All!

What must I do in order for me to prevent multiple instances of the form?

This code still allows to have another instance of the form:

            Dim frm As frmVolAgeWarranty
            '  If the instance still exists... (ie. it's Not Nothing)
            If Not IsNothing(frm) Then
                '  and if it hasn't been disposed yet
                If Not frm.IsDisposed Then
                    '  then it must already be instantiated - maybe it's
                    '  minimized or hidden behind other forms ?
                    frm = New frmVolAgeWarranty
                    frm.BringToFront()  '  Optional
                Else
                    '  else it has already been disposed, so you can
                    '  instantiate a new form and show it
                    frm = New frmVolAgeWarranty()
                    frm.Show()
                End If
            Else
                '  else the form = nothing, so you can safely
                '  instantiate a new form and show it
                frm = New frmVolAgeWarranty()
                frm.Show()
            End If