private void loadDangNhap()
{
Form f = isActive(typeof(frmDangNhap));
if (f == null)
{
frmDangNhap fDangNhap = new frmDangNhap();
//fDangNhap.MdiParent = this;
fDangNhap.Show();
}
else
{
f.Activate();
}
}
private void btnCancel_Click(object sender, EventArgs e)
{
frmDangNhap fDangNhap = new frmDangNhap();
fDangNhap.Show();
}