private void insert_btn_Click(object sender, EventArgs e) { Finalize_btn.Enabled = true; int num; if ((exercises_cb.Text == "") || (muscles_cb.Text == "")) { MessageBox.Show("Muscle and Exercise fields cannot be empty!"); } else { if ((int.TryParse(Sets_tb.Text, out num) != true) || (Int32.Parse(Sets_tb.Text) < 1)) { MessageBox.Show("Invalid format for the field: Number of sets!"); } else { var db = new Model1(); var obj = new add_into_database(); Exercises_trainings inserted_extrain = new Exercises_trainings(); if (training_started == false) { training_started = true; inserted_training = obj.add_training(usern, date_dtp.Value); } inserted_extrain = obj.add_exercise_training(exercises_cb.Text, inserted_training.id); obj.add_sets(inserted_extrain, Int32.Parse(Sets_tb.Text)); Sets_tb.Text = ""; } } }