private void barButtonItem6_ItemClick(object sender, ItemClickEventArgs e)
{
Failed_Students f = new Failed_Students();
f.ShowDialog();
}
private void navBarItem9_LinkClicked(object sender, DevExpress.XtraNavBar.NavBarLinkEventArgs e)
{
Failed_Students f = new Failed_Students();
f.ShowDialog();
}
private void metroTile4_Click(object sender, EventArgs e)
{
Failed_Students fs = new Failed_Students();
fs.ShowDialog();
}