public void EditClass_Click(object sender, EventArgs e)
{
int ID = Convert.ToInt32(ClassControl.listView.SelectedItems[0].SubItems[0]);
AddClassForm addCla = new AddClassForm();
addCla.ShowForm(ID);
}
public void AddClass_Click(object sender, EventArgs e)
{
AddClassForm addCla = new AddClassForm();
addCla.ShowForm();
}