private void ViewStudents_Click(object sender, EventArgs e) { NotiLabel.Text = ""; Classes.Enabled = true; Subjects.Enabled = true; EditButton.Enabled = false; listViewInfo = ListViewInfo.Students; _Id.Text = "Student ID"; _Id.Width = 150; _Name.Text = "Student name"; _Name.Width = 175; _Info1.Text = "Class"; _Info1.Width = 125; _Info2.Text = "Date of Birth"; _Info2.Width = 155; _Info3.Text = "Gender"; _Info3.Width = 125; _Info4.Text = "Identify Card No."; _Info4.Width = 150; listView.Items.Clear(); listView.Columns.Clear(); listView.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] { _No, _Id, _Name, _Info1, _Info2, _Info3, _Info4 }); try { StudentServices service = new StudentServices(); var Data = service.GetStudentsFromDB(Classes.SelectedItem.ToString(), Subjects.SelectedItem.ToString()); BindDataToListView(Data); } catch (Exception ex) { MessageBox.Show(ex.Message); } if (listView.Items.Count == 0) { NotiLabel.Text = "Nothing is found..."; } listView.View = View.Details; }