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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.
Updated 30-Jul-13 8:12am
Manfred Rudolf Bihy 30-Jul-13 13:32pm
And your question is?
What have you tried and what problems have you encountered?
Did Google deny you any results from your searches? (hint)
vidkaat 30-Jul-13 14:12pm
updated question
[no name] 30-Jul-13 13:46pm
"Please help", with what? Did you try any of the solutions to the exact same "question" that you are asking? Did they not work for you? Show us the code that you are having trouble with.
vidkaat 30-Jul-13 14:13pm
question updated
[no name] 30-Jul-13 14:17pm
Okay.... Lookup the ASCII value for + and - and add two more Or conditions to your If, that is if you want to continue with the same convention.

1 solution

Have you ever heard about RegEx[^]?
All you need to do is to use IsMatch[^] method with pattern to telephone number.

Example patterns you'll find here:[^][^]

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