public void TestGetCSV() { TestEntity affiliate = new TestEntity(); affiliate.Id = 1000; affiliate.Description = "desc 1"; TestEntity affiliate0 = new TestEntity(); affiliate0.Id = 1001; affiliate0.Description = "desc 2"; TestEntity affiliate1 = new TestEntity(); affiliate1.Id = 1002; affiliate1.Description = "desc 3"; String[] stringArray = new string[] { "amin", "abel" }; affiliate1.StringArray = stringArray; EntityCollection<TestEntity> collection = new EntityCollection<TestEntity>(); collection.Add(affiliate); collection.Add(affiliate0); collection.Add(affiliate1); Console.Write(collection.GetCSV()); }