Passing Id to Model Object

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MVC

Hi,

I am working on web application in MVC 3 using Visual Studio 3. and using sql server 2005 at the back end.
I am creating an account in data base using the HTTPPost method. Account creates successfully. and i get the AccountId of the created account.
Here is the code given below :

[HttpPost]
       public ActionResult Index(Account account)
       {
          string accountId;
          /*
              Here is the code to create account using Linq, 
          */
          account.AccountId = accountId;

          return View("Index", account);
       }

I get the accountId as i checked in debugger and then i assign the accountId to account.AccountId property of the Account Model object.
The AccountId property is attached to text box in the view as given below.

@Html.TextBoxFor(x => x.AccountId);

But when the View is redrawn it still is showing the empty box. The view is a strongly typed view of Account Model class.

No please some one help me immediately where am i going wrong.

thanks in advance.