VB.NET: how to prevent user input in a ComboBox

Question

How do you prevent user input in a ComboBox so that only one of the items in the defined list can be selected by the user?

Answer 1

---- in form level Declaration of cbx veriable---

Dim cbx as string

Private Sub comboBox1_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles comboBox1.Enter
    cbx = Me.comboBox1.Text
End Sub

Private Sub comboBox1_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles comboBox1.Leave
    Me.comboBox1.Text = cbx
End Sub