Member Avatar for Dzulham

I'm new in Vb.net and try to make a simple program. I need one variable to be used in all subs. How can i do that with this:

RTB As Richtextbox = CType(TabControl1.SelectedTab.Controls.Item(0), Richtextbox)
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Member Avatar for Histopathlab

Search in google, you will definitly get information.

Member Avatar for Dzulham

Search in google, you will definitly get information.

I use this,

Public RTB As Richtextbox = CType(TabControl1.SelectedTab.Controls.Item(0), Richtextbox)

Private Sub (Blah Blah) Handles Button1.Click
    If FontDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
        RTB.Font = FontDialog1.Font
    End If
End Sub

And Get error: Object reference not set to an instance of an object.

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