private void ReviewsBtn_Click(object sender, EventArgs e) { var allReviews = Deserializer <Review> .DeserializeFile(@"..\..\Resources\Reviews.txt"); List <string> users = new List <string> { CurrentUser.ReturnCurrentUserEmail() }; var query = users.GroupJoin(allReviews, user => user, review => review.Author, (user, reviewCollection) => new { UserName = user, Reviews = reviewCollection.Select(review => new { subject = review.Subject.Name, comment = review.Comment, rating = review.Rating }) }); MyReviews myReviewsForm = new MyReviews(); myReviewsForm.usernameLabel.Text = CurrentUser.ReturnCurrentUserEmail(); // Enumerate results. foreach (var person in query) { foreach (var item in person.Reviews) { myReviewsForm.reviewListView.Items.Add(new ListViewItem(new string[] { item.subject, item.comment, item.rating.ToString() })); } } myReviewsForm.Show(); }