protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
Session["DN"] = null;
bool check = xl.CheckDangNhap(txtTaiKhoan.Text.Trim(), txtMatKhau.Text.Trim());
if(check==true)
{
Session["DN"] = txtTaiKhoan.Text;
Response.Redirect("GioiThieu.aspx", false);
}
}
}
