StringValueObject

public abstract class StringValueObject<T> where T : StringValueObject<T>
   { 
       public string Value { get; protected set; }

       public static bool operator ==(StringValueObject<T> a, StringValueObject<T> b)
       {
           if (ReferenceEquals(a, b))
           {
               return true;
           }
           if (((object)a == null) || ((object)b == null))
           {
               return false;
           }
           return a.Equals(b);
       }

       public static bool operator !=(StringValueObject<T> a, StringValueObject<T> b)
       {
           return !(a == b);
       }

       protected bool Equals(StringValueObject<T> other)
       {
           return Value.Equals(other.Value);
       }

       public override bool Equals(object obj)
       {
           if (ReferenceEquals(null, obj)) return false;
           if (ReferenceEquals(this, obj)) return true;
           return obj.GetType() == GetType() && Equals((StringValueObject<T>)obj);
       }

       public override int GetHashCode()
       {
           return Value.GetHashCode();
       }

       public static T From(string value)
       {
           var obj = (StringValueObject<T>)Activator.CreateInstance(typeof (T), true);
           obj.Value = value;
           return obj as T;
       }
   }