try this out...
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles ComboBox1.SelectedIndexChanged
Select Case ComboBox1.Text.ToString
Case "test 1"
'Do something
Case "test 2"
'Do something
Case "test 3"
'Do something
End Select
End Sub
Private Sub form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
ComboBox1.Items.Add("test 1")
ComboBox1.Items.Add("test 2")
ComboBox1.Items.Add("test 3")
End Sub