C# Extension Method - Coalesces strings (return first)

/// <summary>
/// Coalesces the specified strings.
/// Example:
///     string result = Coalesce(s.SiteNumber, s.AltSiteNumber, "No Number");
/// </summary>
/// <param name="strings">The strings.</param>
/// <returns></returns>
private static string Coalesce(params string[] strings)
{
    return strings.Where(s => !s.IsNullOrEmpty()).FirstOrDefault();
}