I am new to vs2012.I am trying to run MVC3 tutorial to experience the working of vs2012. I have ran thesame tutorial on vs2010 successfully and inserted new record. Now I want to run thesame tutorial on vs2012. On both cases, i am using sqlserver management studio and entity framework(dotnet 4.0).I used SSMS2008 for VS2010 and SSMS2012 for VS2012. Program ran successfully on vs2012 but was unable to insert new record to database.Note i have googled this and tried many suggestions all to no avail.. Here is the code:

namespace LatestBlog.Controllers { public class PostsController : Controller { private BlogEntities model = new BlogEntities();

    public ActionResult Index()
    {
        return View();
    }
    [ValidateInput(false)]
    public ActionResult Update(int? id, string title, string body, DateTime datetime, string tags)
    {
        if (!IsAdmin)
        {
            return RedirectToAction("Index");
        }
        Post post = GetPost(id);
        post.Title = title;
        post.Body = body;
        post.DateTime = datetime;
        post.Tags.Clear();
        tags = tags ?? string.Empty;
        string[] tagNames = tags.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        foreach (string tagname in tagNames)
        {
            post.Tags.Add(GetTag(tagname));
        }
        if (!id.HasValue)
        {
            try
            {
                //model.AddToPost(post);
                model.Posts.Add(post);
            }
            catch (Exception exp)
            {
                throw new Exception("ERROR: Unable to Add post to database - " + exp.Message.ToString(), exp);
            }                 

        }
        model.SaveChanges();
        return RedirectToAction("Details", new { id = post.ID });
    }
    public ActionResult Edit(int? id)
    {
        Post post = GetPost(id);
        StringBuilder tagList = new StringBuilder();//...........................
        foreach (Tag tag in post.Tags)
        {
            tagList.AppendFormat("{0}", tag.Name);
        }
        ViewBag.Tags = tagList.ToString();
        return View(post);
    }
    private Tag GetTag(string tagName)
    {
        return model.Tags.Where(x => x.Name == tagName).FirstOrDefault() ?? new Tag() { Name = tagName };
    }

    private Post GetPost(int? id)
    {
        return id.HasValue ? model.Posts.Where(x => x.ID == id).First() : new Post() { ID = -1 };
    }
    public bool IsAdmin
    {
        get
        {
            // To do, don't just return true
            return true; //Session["IsAdmin"] != null && (bool)Session["IsAdmin"]; 
        }
    }
}

}