Type aliasing in C#

Type_aliasing_in_csharp.cs

    /// <summary>
    /// Effectively an alias of string, but with a stronger semantic
    /// </summary>
    /// <remarks>
    /// Can still pass it to something (eg a screen element, or a db, that expects a string), but get to call it
    /// by a semantically richer type name everywhere, especially where it may be returned (returned things not
    /// being named, except indirectly by the method name)
    /// </remarks>
    public class FooId
    {
        private readonly string fooId;

        public FooId(string fooId)
        {
            this.fooId= fooId;
        }

        private string Id
        {
            get { return fooId; }
        }

        public static implicit operator string(FooId fooId)
        {
            return fooId.Id;
        }
    }