CRM Connection without CrmServiceClient

public static IOrganizationService GetCRMConnection(bool CheckConnection = false)   
    {
        string crmServerName = ConfigurationManager.AppSettings["crmServerName"].ToString(); //--- You can also put IP address of your CRM server             
        string crmOrganizationName = ConfigurationManager.AppSettings["crmOrganizationName"].ToString();
        string userName = ConfigurationManager.AppSettings["crmuserName"].ToString();
        string password = ConfigurationManager.AppSettings["crmpassword"].ToString();
        string protocol = ConfigurationManager.AppSettings["crmprotocol"].ToString();

        ClientCredentials credentials = new ClientCredentials();
        credentials.UserName.UserName = userName;
        credentials.UserName.Password = password;

        Uri serviceUri = new Uri(protocol + "://" + crmServerName + "/" + crmOrganizationName + "/XRMServices/2011/Organization.svc"); 

        OrganizationServiceProxy proxy = new OrganizationServiceProxy(serviceUri, null, credentials, null);
        proxy.EnableProxyTypes();
        IOrganizationService crmService = (IOrganizationService)proxy;

        if (CheckConnection)
            {
                Guid userid = ((WhoAmIResponse)crmService.Execute(new WhoAmIRequest())).UserId;
            }
             return crmService;
    }