private void button1_Click(object sender, EventArgs e) { string studentselected = this.comboBox1.GetItemText(this.comboBox1.SelectedItem); string gradetext = this.comboBox2.GetItemText(this.comboBox2.SelectedItem); int grade = Int32.Parse(gradetext); int studentid = 0; int teacherid = 0; List <Teacher> teacherlist = duombaze.GetTeacher(); foreach (Teacher teacher in teacherlist) { if (MainWindow.LoggedInUser.GetFullName() == teacher.Name + " " + teacher.Surname) { teacherid = teacher.Id; } } int lessonid = 0; List <Student> studentlist = duombaze.GetStudent(); foreach (Student student in studentlist) { if (studentselected == student.Name + " " + student.Surname) { studentid = student.Id; } } List <Lesson> lessonlist = duombaze.Getlesson(); foreach (Lesson lesson in lessonlist) { if (lesson.Teacherid == teacherid) { lessonid = lesson.Id; } } duombaze.AddNewGrade(grade, studentid, teacherid, lessonid); MessageBox.Show("Pazymis sekmingai pridetas"); this.Close(); }