private void button1_Click(object sender, EventArgs e) { string teacherelected = this.comboBox1.GetItemText(this.comboBox1.SelectedItem); int teacherid = 0; string teachername = ""; string teachersurname = ""; List <Teacher> teacherlist = duombaze.GetTeacher(); foreach (Teacher teacher in teacherlist) { if (teacherelected == teacher.Name + " " + teacher.Surname) { teacherid = teacher.Id; teachername = teacher.Name; teachersurname = teacher.Surname; } } duombaze.RemoveTeacher(teacherid, teachername, teachersurname); }