private void btn_login_Click(object sender, EventArgs e)
{
string userName = tb_username.Text.Trim();
string password = tb_pass.Text.Trim();
taiKhoanForm = userName;
bool bl = ub.CheckLogin(userName, password);
Admin fm = new Admin();
if (bl)
{
tb_username.Clear();
tb_pass.Clear();
this.Hide();
fm.ShowDialog();
this.Show();
}
else
{
tb_username.Clear();
tb_pass.Clear();
MessageBox.Show("Tai Khoan hoac Mat Khau sai vui long nhap lai!");
}
}