public AddPartTree(TestCreate _form, string _numTeacher)
 {
     InitializeComponent();
     form = _form;
     conn = new SqlConnection(connectionString);
     comm = new SqlCommand();
     comm.Connection = conn;
     NumPrepod = _numTeacher;
 }
 private void btnNext_Click(object sender, EventArgs e)
 {
     if (tBNameTest.Text != "" && rtBDescTest.Text != "" && tBThemeTest.Text != "")
     {
         TestCreate test = new TestCreate(tBNameTest.Text,rtBDescTest.Text,tBThemeTest.Text,NumTeacher);
         this.Hide();
         test.Show();
     }
     else
         MessageBox.Show("Заполнены не все поля!", "Ошибка");
 }