My Login solution using MVC and querying against my LDAP server for Umbraco 6

MemberLogin.cshtml

@model UmbracoLogin.MemberLoginModel
    @using (Html.BeginUmbracoForm("MemberLogin", "MemberLoginSurface"))
    {
        <div class="control-group">
            <label class="control-label" for="username">Username<span class="required">*</span></label>
            <div class="controls">
                <input id="username" type="text" name="Username" class="span3 required" data-fieldid="0">
            </div>
        </div>
        <div class="control-group">
            <label class="control-label" for="password">Password<span class="required">*</span></label>
            <div class="controls">
                <input id="password" type="password" name="Password" class="span3 required" data-fieldid="1">
            </div>
        </div>
        <button id="submit" class="btn btn-success" type="submit" name="submit">Login</button>
    }

@if (TempData["Status"] != null)
{
<div class="row-fluid">
    <div class="span6 alert alert-error fade in">
        <button class="close" data-dismiss="alert">×</button>
        <strong>@TempData["Status"]</strong>
    </div>
</div>
}

MemberLoginSurfaceController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Mvc;
using System.Web.Security;
using umbraco.cms.businesslogic.member;
using System.ComponentModel.DataAnnotations;
using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;

namespace UmbracoLogin
{
    public class MemberLoginModel
    {
        [Required, Display(Name = "Username")]
        public string Username { get; set; }

        [Required, Display(Name = "Password"), DataType(DataType.Password)]
        public string Password { get; set; }

        [Display(Name = "Remember me")]
        public bool RememberMe { get; set; }
    }

    public class MemberLoginSurfaceController : Umbraco.Web.Mvc.SurfaceController
    {
        
        [HttpGet]
        [ActionName("MemberLogin")]
        public ActionResult MemberLoginGet()
        {
            return PartialView("MemberLogin", new MemberLoginModel());
        }

        [HttpGet]
        [ActionName("MemberLogout")]
        public ActionResult MemberLogout()
        {
            Session.Clear();
            FormsAuthentication.SignOut();
            return Redirect(Request.UrlReferrer.ToString());
        }

        [HttpPost]
        [ActionName("MemberLogin")]
        public ActionResult MemberLoginPost(MemberLoginModel model, string returnUrl)
        {
            if (ModelState.IsValid)
            {
                // do the login here...
                // need to do some AD checking to confirm this is the right username and password..

                string ldapPath = "LDAP://ldap_ip_address_here/DC=som,DC=marshall,DC=edu"; // ie. LDAP://DC=foo,DC=bar,DC=com
                DirectoryEntry d = new DirectoryEntry(ldapPath);
                d.Username = model.Username;
                d.Password = model.Password;
                d.AuthenticationType = AuthenticationTypes.Secure;

                try
                {
                    string n = d.Name;
                }
                catch (Exception ex)
                {
                    // logon failed...
                    TempData["Status"] = ("Login Failed: Wrong Username/Password Combination");
                    return Redirect(Request.UrlReferrer.ToString());
                }
                finally
                {
                    d.Close();
                }

                string sourceDomain = "";

                // if we logon then do some umbraco housekeeping...         


                // check to see if the user exists as a member 
                if (Membership.GetUser(model.Username) == null)
                {

                    string email = string.Format("{0}@marshall.edu", model.Username);
                    string name = model.Username;


                    // if user doesn't exist create membership.
                    // we are using the default membership provider so we can maintain compatability.
                    // but for umbraco this only works if you set defaultMemberTypeAlias to the right thing
                    // in your web.config file.

                    try
                    {
                        MembershipUser newMember = Membership.CreateUser(model.Username, "tree4tr4", email);

                        Member umbracoMember = Member.GetMemberFromLoginName(model.Username);
                        umbracoMember.Text = name;
                        //umbracoMember.getProperty("sourceDomain").Value = sourceDomain;
                        umbracoMember.Save();
                    }
                    catch (Exception ex)
                    {
                        throw new Exception(string.Format("Username [{0}] \n {1}", model.Username, ex.ToString()));
                    }

                }

                // Log user in automajically. 
                // again standard formsAuthentication so you can control all of this from the authentication 
                // section of web.config. 
                // FormsAuthentication.RedirectFromLoginPage(username, true) ;

                // umbraco doesn't pass the refering path to login, it actually just renders the login page
                // at the current URL, so you just redirect back to self. 

                //if (string.IsNullOrEmpty(Request.QueryString["pauselogon"]))
                //{
                //    FormsAuthentication.SetAuthCookie(model.Username, true);
                //    Response.Redirect(Request.Url.ToString());
                    // Response.Write("Redirect will go here"); 
               // }
               // else
                //{
                //    Response.Write("Logon Paused. <a href='" + Request.Url.ToString() + "'>Carry on</a>");
                //}
                FormsAuthentication.SetAuthCookie(model.Username, false);
                return Redirect(Request.UrlReferrer.ToString());
            }
            TempData["Status"] = "Please enter your Username and Password to Login";
            return Redirect(Request.UrlReferrer.ToString());
        }
    }
}