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

In this article, I am trying to explain how to Create, Update, Delete, Retrieve using Organization service.
To use Organization service , Add Organization.svc Service Reference in your Visual studio Solution
In First Step I am declaring and Initializing IOrganizationService Object, To Inatalizing Object i am using some functions

IOrganizationService service= GetSoapService();

//Function for object Initalization
public static IOrganizationService GetSoapService()
{
    Uri serviceUrl = CombineUrl(GetServerBaseUrl(), "/XRMServices/2011/Organization.svc/web");

    BasicHttpBinding binding = new BasicHttpBinding(Uri.UriSchemeHttps == serviceUrl.Scheme
        ? BasicHttpSecurityMode.Transport : BasicHttpSecurityMode.TransportCredentialOnly);
    binding.MaxReceivedMessageSize = int.MaxValue;
    binding.MaxBufferSize = int.MaxValue;
    binding.SendTimeout = TimeSpan.FromMinutes(2);

    return new SilverCrmSoap.CrmSdk.OrganizationServiceClient(binding, new EndpointAddress(serviceUrl));
}

public static Uri GetServerBaseUrl()
{
    //comment before using as webResource
    string serverUrl = "http://crm2011:5555/ITSoft";

    //Uncomment before using as webResource
    //string serverUrl = (string)GetContext().Invoke("getServerUrl");

    if (serverUrl.EndsWith("/"))
    serverUrl = serverUrl.Substring(0, serverUrl.Length - 1);

    return new Uri(serverUrl);
}

public static Uri CombineUrl(Uri baseValue, string value)
{
   if (null == baseValue)
   {
       throw new ArgumentNullException("baseValue");
   }
   else if (string.IsNullOrEmpty(value))
   {
      return baseValue;
   }

    //Ensure that a double '/' is not being added
    string newValue = baseValue.AbsoluteUri;
    if (!newValue.EndsWith("/", StringComparison.Ordinal))
    {
       //Check if there is a character at the beginning of value
       if (!value.StartsWith("/", StringComparison.Ordinal))
       {
          newValue += "/";
        }
     }
     else if (value.StartsWith("/", StringComparison.Ordinal))
     {
        value = value.Substring(1);
     }

      //Create the combined URL
      return new Uri(newValue + value);
}

Code to Create Account

void CreateAccount()
{
   Entity entity = new Entity();
   entity.LogicalName = "account";
   entity.Id = new Guid(); //if we will not pass, API will create
   entity["name"] = "Create Account using ORganization Service";
   service.BeginCreate(entity, new AsyncCallback(CreateAccount), service);
}
void CreateAccount(IAsyncResult result)
{
    Guid accoutid =  ((IOrganizationService)result.AsyncState).EndCreate(result);
}

Code to Update Account

void UpdateAccount(Guid AccountID)
{
     Entity entity = new Entity();
     entity.LogicalName = "account";
     entity.Id = AccountID;
     entity["name"] = "Update Account using ORganization Service";
     service.BeginUpdate(entity, new AsyncCallback(UpdateAccount), service);
}
void UpdateAccount(IAsyncResult result)
{
     ((IOrganizationService)result.AsyncState).EndUpdate(result);
}

Code to Delete Account

public void DeleteAccount(Guid AccountID)
{
     service.BeginDelete("account", AccountID, new AsyncCallback(DeleteAccount), service);
}

private void DeleteAccount(IAsyncResult result)
{
     ((IOrganizationService)service).EndDelete(result);
}

Code to Retrieve Account

void RetrieveAccount(Guid AccountID)
{
     ColumnSet _cols = new ColumnSet()
     {
         Columns = new ObservableCollection<string>(new string[] { "parentcustomerid", "accountid" })
         //AllColumns = true
      };
      service.BeginRetrieve("account", AccountID, new AsyncCallback(RetrieveAccount), service);
}
private void RetrieveAccount(IAsyncResult result)
{
      Entity _account =  ((IOrganizationService)service).EndRetrieve(result);
}

Code to Retrieve Multiple Account

void RetrieveMultipleAccount(Guid AccountID)
{
     QueryExpression query = new QueryExpression()
     {
          EntityName = "account",
          ColumnSet = new ColumnSet()
          {
              AllColumns = true
          },

          Criteria = new FilterExpression()
          {
              Conditions = new ObservableCollection<ConditionExpression>(
              new ConditionExpression[]
                  {
                      new ConditionExpression(){
                      AttributeName="parentcustomerid",
                      Operator = ConditionOperator.Equal,
                       Values = new ObservableCollection<object>{AccountID}
                          }
                   })
            },
            };
       OrganizationRequest _OrgRequest = new OrganizationRequest() { RequestName = "RetrieveMultiple" };
       _OrgRequest["Query"] = query;
        service.BeginExecute(_OrgRequest, new AsyncCallback(RetrieveMultipleAccount), service);
}

void RetrieveMultipleAccount(IAsyncResult result)
{
    OrganizationResponse response = ((IOrganizationService)service).EndExecute(result);
    EntityCollection results = (EntityCollection)response["EntityCollection"];
}