Validate SSN

The following sampel code can be used for validating Social Security Number (SSN)

using System.Text.RegularExpressions;

public class SsnTextBox: RegExTextBox
{
    public SsnTextBox() 
	{       
        InitializeComponent();
        this.ValidationExpression = @"^\d{3}-\d{2}-\d{4}$";
        this.ErrorMessage = "The social security number must be in the form of 555-55-5555";
    }
}