private void apply_btn_Click(object sender, EventArgs e)
{
if (studentName.Text == "")
{
Hide();
return;
}
if (m_student == null)
{
m_student = new Student();
GlobalData.addStudent(m_student);
}
m_student.Name = studentName.Text;
m_student.Group = groupName.Text;
m_student.clearSubjects();
foreach (Subject subject in selectedSubjects.Items)
{
m_student.addSubject(subject);
}
DialogResult = DialogResult.Yes;
Hide();
}