Validation By Function ASP.Net

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<%@ Page Language=VB Debug=true %>


Validating a Phone Number with a RegularExpressionValidator Control





Please enter your phone number:

    id="txtPhoneNumber" 
    runat=server 
/>
    id="regZipCode"
    controltovalidate="txtPhoneNumber"
    validationexpression="\(\d{3}\) \d{3}\-\d{4}"
    display="Dynamic"
    font-name="Arial" 
    font-size="11"
    runat=server
>
    You must enter a phone number in the form of (999) 999-9999.




    id="butOK"
    text="OK"
    type="Submit"
    runat="server"
/>