Textbox validation to accept numbers,+,- and empty space

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VB

Hi All,

I want to do a validation to a text box which is a phone number which accepts numbers,symbols like "+","-",empty space

e.g +49 561 56789-0

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
If Asc(e.KeyChar) < 48) _
               Or Asc(e.KeyChar) > 57) Then
            e.Handled = True
        End If
        If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
            e.Handled = False
        End If
end sub

I know this would check only numbers but i need to include two symbols "+","-"...Not sure how do i do this.


Please help. Thanks.