private void DeleteGradeButton_Click(object sender, EventArgs e)
{
DeleteGradeButton.Enabled = false;
try
{
repository.DeleteStudentGrade(Global.WorkTitle, Global.UserID);
DisplayingGradesInListView();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}