Silverlight Create, Update, Delete , Retrieve, MultipleRetrieve using Organization OData Service in CRM 2011

In my previous article, i explained all Create , Update ,Delete , Retrieve using Organization service and now in my
current article, I am trying to explain how to Create, Update, Delete, Retrieve using Organization OData service.
To use Organization OData service , Add ODataOrganization.svc Service Reference in your Visual studio Solution
In First Step I am declaring and Initializing SynchronizationContext Object, To Inatalizing Object i am using some functions

SynchronizationContext _syncContext = SynchronizationContext.Current;

//Get the ServerUrl (ServerUrl is formatted differently OnPremise than OnLine)
String _serverUrl = GetServerUrl();

if (!String.IsNullOrEmpty(_serverUrl))
{

    //Setup Context
    AEDevContext _context = new AEDevContext(
         new Uri(String.Format("{0}/xrmservices/2011/organizationdata.svc/",
                 _serverUrl), UriKind.Absolute));

    //This is important because if the entity has new
    //attributes added the code will fail.
    _context.IgnoreMissingProperties = true;
}

//Function for object Initalization
public static String GetServerUrl()
{
    String serverUrl = String.Empty;
    //Try to get the ServerUrl from the Xrm.Page object
    serverUrl = GetServerUrlFromContext();
    return serverUrl;
}

private static String GetServerUrlFromContext()
{
    // If the Silverlight is in a form, this will get the server url
    ScriptObject xrm = (ScriptObject)HtmlPage.Window.GetProperty("Xrm");
    ScriptObject page = (ScriptObject)xrm.GetProperty("Page");
    ScriptObject pageContext = (ScriptObject)page.GetProperty("context");
    //Uncomment before using as webResource
    //String serverUrl = (String)pageContext.Invoke("getServerUrl");
    //comment before using as webResource
    String serverUrl  ="http://crm2011:5555/ITSoft";

    //The trailing forward slash character from CRM Online needs to be removed.
    if (serverUrl.EndsWith("/"))
    {
        serverUrl = serverUrl.Substring(0, serverUrl.Length - 1);
     }

    return serverUrl;
}

Code to Create Account

private void CreateAccount()
{
   Account _account = new Account();
   _account.Name = "Account created using Silverligh ODataService";
   _context.AddToAccountSet(_account);
   _context.BeginSaveChanges(CreateAccount, _account);
}
private void CreateAccount(IAsyncResult result)
{
   _context.EndSaveChanges(result);
   Account _account = result.AsyncState as Account;
}

Code to Update Account

private void UpdateAccount(Guid _accountid)
{
   Account _account = new Account();
   _account.Name = "Update account using Silverligh ODataService";
   _account.AccountId = _accountid;
   _context.AttachTo("AccountSet", _account);
   _context.UpdateObject(_account);
   _context.BeginSaveChanges(UpdateAccount, _account);
}
private void UpdateAccount(IAsyncResult result)
{
   _context.EndSaveChanges(result);
   Account _account = result.AsyncState as Account;
}

Code to Delete Account

private void DeleteAccount(Account _account)
{
   _context.DeleteObject(_account);
   _context.BeginSaveChanges(DeleteAccount, _account);
}
private void DeleteAccount(IAsyncResult result)
{
   Account deletedAccount = result.AsyncState as Account;
   _context.EndSaveChanges(result);
}

Code to Retrieve Account

private void RetrieveAccount(Guid _accountid)
{
    DataServiceQuery<Account> query = (DataServiceQuery<Account>)_context
         .AccountSet.Where<Account>(a => a.AccountId == _accountid);

    query.BeginExecute(RetrieveAccount, query);
}
private void RetrieveAccount(IAsyncResult result)
{
   DataServiceQuery<Account> results =
         result.AsyncState as DataServiceQuery<Account>;

   Account _account = new DataServiceCollection<Account>(results
         .EndExecute(result)).First<Account>();
}

Code to Retrieve Multiple Account

private void RetrieveMultipleAccount()
{
    DataServiceQuery<Account> accounts = (DataServiceQuery<Account>)this._context
        .AccountSet.Take<Account>(10);
    accounts.BeginExecute(RetrieveMultipleAccount, accounts);

}
private void RetrieveMultipleAccount(IAsyncResult result)
{
   //Retrieve the query that was
   DataServiceQuery<Account> results = result.AsyncState as DataServiceQuery<Account>;
   ObservableCollection<Account> _accounts =
            new DataServiceCollection<Account>(results.EndExecute(result));
}