private void btsignin_Click(object sender, EventArgs e)
{
QLKSLinQDataContext dulieu = new QLKSLinQDataContext();
var kt = (from Login in dulieu.Logins
where Login.TenDangNhap == txtTenDangNhap.Text.Trim() && Login.MatKhau == txtMatKhau.Text
select Login).SingleOrDefault();
if (kt == null)
{
MessageBox.Show("Dang nhap khong thanh cong!");
}
else
{
frmMain fmain = new frmMain(kt.MaNhanVien);
this.Hide();
fmain.ShowDialog();
this.Show();
}
}
