Navigating to Dynamic CRM home page after authentication

I need to navigate to dynamic CRM main page after external login authentication.

http://msdn.microsoft.com/en-us/library/hh675404.aspx

I have successfully able to retrieve the loged user details but i dont know how to redirect to the main page from my external page. below is part of my code.

Response.Redirect navigate back to the login page.

// This statement is required to enable early-bound type support.
                organizationProxy.EnableProxyTypes();

                // Now make an SDK call with the organization service proxy.
                // Display information about the logged on user.
                Guid userid = ((WhoAmIResponse)organizationProxy.Execute(
                    new WhoAmIRequest())).UserId;
                SystemUser systemUser = organizationProxy.Retrieve("systemuser", userid,
                    new ColumnSet(new string[] { "firstname", "lastname" })).ToEntity<SystemUser>();
                Response.Write("Logged on user is {0} {1}."+
                    systemUser.FirstName+" "+ systemUser.LastName);
                Response.Redirect("https://redrocksoftware.crm5.dynamics.com/default.aspx");