DataContext.cs

public IQueryable<Post> GetCategories()
        {
            var query = (from p in Post
                         select new Post
                         {
                             Category = p.Category,
                         }).Distinct();

            return query;
        }
        
        public IQueryable<Post> GetPost()
        {
            var query = (from p in Post
                         select new Post
                         {
                             Id = p.Id,
                             Header = p.Header,
                             Text = p.Text,
                             DateCreated = p.DateCreated,
                             Thumbnail = p.Thumbnail,
                         });

            return query;
        }