public class BaseDoc
		{
			public string User;
		}

		public class DocumentA: BaseDoc {}

		public class DocumentB: BaseDoc {}

		public class DocumentC: BaseDoc {}

		public class DocumentD: BaseDoc {}

		public class DocumentE: BaseDoc {}

		public class DocumentF: BaseDoc {}

		public class DocumentG: BaseDoc {}

		public class DocumentH: BaseDoc {}

		public class DocumentRepository<T> where T: BaseDoc
		{
			public List<T> documents;

			public DocumentRepository()
			{
				documents = new List<T>();
			}

			public IEnumerable<T> GetUserDocuments(string user)
			{
				return documents.Where(x => x.User == user);
			} 
		}