[seaman]

Попробуй так:
http://stackoverflow.com/questions/7...g-t-to-an-enum

public T GetEnumFromString<T>(string value) where T : struct, IConvertible
{
   if (!typeof(T).IsEnum) 
   {
      throw new ArgumentException("T must be an enumerated type");
   }

   //...
}

Или так:
http://stackoverflow.com/questions/1...nts-in-c-sharp