How to edit using ViewData model - asp.net

Question

I have created a View Model based on combination of three Tables.
I click on Edit action it displays the Data from Three tables correctly.
But when i click on Save button i am not able to get data either from FormCollection or from Request["Id"]
Please suggest it the possible way.
public class ConferenceResourceEditModel
{
public ConferenceRoom ConferenceRoom { get; set; }
public Resources Resources { get; set; }
public ResourceAllocation ResourceAllocation { get; set; }
}
public ActionResult Edit(int id)
{
//ConferenceRoom conferenceroom = db.ConferenceRooms.Find(id);
var query =
from c in db.ConferenceRooms
from r in db.Resourcess
from ra in db.ResourceAllocation
where c.ConferenceID == id
where c.ConferenceID == ra.ConferenceID
where r.ResourceID ==ra.ResourceID
select new ConferenceResourceEditModel { ConferenceRoom = c, Resources = r,ResourceAllocation=ra };
return View(query);
}
//
// POST: /ConferenceRoom/Edit/5
[HttpPost]
public ActionResult Edit(FormCollection form, int id, ConferenceResourceEditModel conferenceroom,ConferenceRoom crf)
{
if (ModelState.IsValid)
{
db.Entry(conferenceroom).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(conferenceroom);
}

Answer 1

Look up model binding on the http://www.asp.net/mvc site where there are magnificent tutorials about this kind of thing.
in a nutshell your controller action will take a parameter of type YOURVIEWMODEL and bind to it automatically

Answer 2

Use some ORM ( like EntityFramework,personally i recommend DatabaseFirst approach). Using something like that:
var query =
from c in db.ConferenceRooms
from r in db.Resourcess
from ra in db.ResourceAllocation
where c.ConferenceID == id
where c.ConferenceID == ra.ConferenceID
where r.ResourceID ==ra.ResourceID
is much more complicated and difficult. Hope it will help.