private void addStudentItem_Click(object sender, EventArgs e) { if (Text_boxes_empty()) { return; } if (students == null) { students = new StudentsCollection(); } if (students.GetEnumerator().Position + 1 >= students.students_list.Count) { students.AddStudent(new Student(FirstNameTextBox.Text, SecondNameTextBox.Text, FacultyTextBox.Text)); students.GetEnumerator().MoveEnd(); deleteStudent.Enabled = true; SetButtonEnable(TypeAction.Next, false); SetButtonEnable(TypeAction.Prev, true); need_updated = true; FirstNameTextBox.Focus(); MoveToAddForm(); toolStripLabelnfo.Text = "Студент добавлен"; } else { toolStripLabelnfo.Text = "Перейдите в поле для добавления"; } }