protected void Btnstudent_Click(object sender, EventArgs e) { int Rgrade = Int32.Parse(DDLgrade.SelectedValue); int Rclass = Int32.Parse(DDLclass.SelectedValue); LearnSite.BLL.Students bll = new LearnSite.BLL.Students(); LearnSite.Common.CookieHelp.SetStudentCookies(bll.GetRndModel(Rgrade, Rclass)); System.Threading.Thread.Sleep(1000); Response.Redirect("~/index.aspx", false); }