private void button1_Click(object sender, EventArgs e)
 {
     try
     {
         User user = new User(0, textBoxName.Text, textBoxSurname.Text, dateTimePicker1.Value, textBoxName.Text, textBoxSurname.Text, comboBox1.Text, comboBox2.Text);
         if (comboBox1.Text == "Studentas")
         {
             duombaze.AddNewStudent(textBoxName.Text, textBoxSurname.Text, comboBox2.Text);
         }
         if (comboBox1.Text == "Destytojas")
         {
             duombaze.AddNewTeacher(textBoxName.Text, textBoxSurname.Text);
         }
         duombaze.Register(user);
         MessageBox.Show($" Sekmingai priregistruota");
         this.Close();
     }
     catch (Exception error)
     {
         MessageBox.Show(error.Message);
     }
 }