public FormViewStudentMarks(FormPromoteStudent form, PromoteStudentViewModel dataBoundItem)
 {
     InitializeComponent();
     this.studentInfo = dataBoundItem;
     this.form        = form;
     LoadData();
 }
 private void FormPromoteStudent_FormClosed(object sender, FormClosedEventArgs e)
 {
     _instance = null;
 }