ASP.NET RegularExpressionValidator - Validate U.S. Social Security Number

asp.net RegularExpressionValidator: how to validate U.S. Social Security Number
ValidateUSSocialSecurityNumber.aspx
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    protected void Page_Load(object sender, System.EventArgs e)
    { 
        if(!this.IsPostBack)
        {
            Label1.Font.Bold = true;
            Label1.Font.Italic = true;
            Label1.Font.Size = FontUnit.Large;
            Label1.ForeColor = System.Drawing.Color.Crimson;
            TextBox1.BackColor = System.Drawing.Color.SlateBlue;
            TextBox1.ForeColor = System.Drawing.Color.AliceBlue;
            Button1.Font.Bold = true;
            Button1.ForeColor = System.Drawing.Color.SlateBlue;
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = "Your Social Security Number: " + TextBox1.Text.ToString();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>asp.net RegularExpressionValidator: how to validate U.S. Social Security Number</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">RegularExpressionValidator<br /><i>U.S. Social Security Number</i></h2>
        <asp:Label 
             ID="Label1" 
             runat="server"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             Text="U.S. Social Security Number"
             Font-Bold="true"
             ForeColor="SlateBlue"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1" 
             runat="server"
             >
        </asp:TextBox>
        <asp:RequiredFieldValidator 
             ID="RequiredFieldValidator1"
             runat="server"
             ControlToValidate="TextBox1"
             Text="*"
             >
        </asp:RequiredFieldValidator>
        <asp:RegularExpressionValidator 
            ID="RegularExpressionValidator1"
            runat="server" 
            ValidationExpression="\d{3}-\d{2}-\d{4}"
            ControlToValidate="TextBox1"
            ErrorMessage="Input valid U.S. Social Security Number!"
            ></asp:RegularExpressionValidator>
        <br /><br />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             Text="Submit U.S. Social Security Number"
             OnClick="Button1_Click"
             />
    </div>
    </form>
</body>
</html>










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