Thanks for helping me out: VB 2003

Combobox collection from -3 to +3

The goal of the message is to warn the user that the systems only covers +- 3 timezones, if he types in for example +4 or -4, he gets the message (by the way: how to protect the system if he types for instance a character?)

When I run the application: 'Unhandled exception: Cast from string "click" to type 'integer' is not valid

Private Sub ComboBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.TextChanged

'if more more than 3 timezones
Dim utc As Integer
utc = ComboBox1.Text
If utc < -3 > 3 Then
MsgBox("Calculations only for maximum 3 Time Zones", MsgBoxStyle.OKOnly, "Info")
ComboBox1.Text = 0
End If
End Sub