How to validate US Zip Code in C#

On By TienIn .Net Framework

The following function will ensure the zip code in the following format

12345 or 54321-1234

public bool IsZipCode(string zipCode)
{
      string pattern = @"^\d{5}(\-\d{4})?$";
      Regex regex = new Regex(pattern);

      return regex.IsMatch(zipCode);
}