protected void Button1_Click(object sender, EventArgs e) { AdminDataAccess adminData = new AdminDataAccess(); //if ((adminData.GetAdminUsers().Select(x => x.UserName == txtUsername.Text)).FirstOrDefault() // && (adminData.GetAdminUsers().Select(x => x.PassWord == txtPassword.Text)).FirstOrDefault()) if (adminData.GetAdminUsers().ToList().Where(x => (x.UserName == txtUsername.Text && x.PassWord == txtPassword.Text)).Any()) { Response.Redirect("DisplayStudent.aspx"); } else { errorMessage.Text = " Enter a valid Username or a Password"; } }