private void button1_Click(object sender, EventArgs e) { string courseselected = this.comboBox1.GetItemText(this.comboBox1.SelectedItem); int courseid = 0; int lessonid = 0; List <Course> courselist = duombaze.GetCourse(); List <Lesson> lessonlist = duombaze.Getlesson(); foreach (Course course in courselist) { if (courseselected == course.Name) { courseid = course.Id; } } foreach (Lesson lesson in lessonlist) { if (lesson.Courseid == courseid) { lessonid = lesson.Id; } } duombaze.RemoveLesson(lessonid, courseid); MessageBox.Show("Paskaita sekmingai panaikinta"); this.Close(); }