System.InvalidOperationException in Application designer.vb

[OptionBase1]

Thank you OptionBase1
Having understood your analogy I have corrected the code

Great! Wait...

    Private Sub nudFSize_ValueChanged(sender As Object, e As EventArgs) Handles nudFSize.ValueChanged
        Dim nudFSize As Integer
        Dim FSize As Integer = nudFSize
    End Sub

Nope. Good luck.