How to redirect on required page based upon role

I want to redirect on the user and admin page based upon role.what code should i write for this
public partial class Login : System.Web.UI.Page {
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ABCNETConnectionString8"].ConnectionString);
protected void Page_Load(object sender, EventArgs e) { }
protected void Loginnewpage_Authenticate(object sender, AuthenticateEventArgs e) { if (Membership.ValidateUser(Loginnewpage.UserName, Loginnewpage.Password) == true) {
Loginnewpage.Visible = true; Session["user"] = User.Identity.Name; FormsAuthentication.RedirectFromLoginPage(Loginnewpage.UserName, true); Response.Redirect("~/Admin/Admin.aspx") } else { Response.Write("Invalid Login"); } } }