Error in Plugin which call WCF service. localContext.ServiceProvider is null.localContext.ServiceProvider is null.

Hello,

I am writing Plugin on Sales Order Save event which calls WCF service.

I got reference in

http://nishantrana.wordpress.com/2010/11/20/calling-wcf-service-in-plugin-in-crm/

and modified my code and web config.

But now i got error "Object reference not set to an instance of an object"

I debugged and found that i got "Null" in localContext.ServiceProvider.

My code is as below.

protected void ExecuteCRMOrderToAX(LocalPluginContext localContext)
        {
            if (localContext == null)
            {
                throw new ArgumentNullException("localContext");
            }

            BasicHttpBinding myBinding = new BasicHttpBinding();

            myBinding.Name = "BasicHttpBinding_SalesOrderService";

            myBinding.Security.Mode = BasicHttpSecurityMode.None;

            myBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;

            myBinding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.None;

            myBinding.Security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName;

            EndpointAddress endPointAddress = new EndpointAddress("http://<<myaxurl>>/MicrosoftDynamicsAXAif50/salesorderservice.svc");
            // TODO: Implement your custom Plug-in business logic.
            var serviceProvider = localContext.ServiceProvider;  // Here i m getting serviceProvider as null

            #region "Passing CRM Credential"

            ax.SalesOrderServiceClient sc = new ax.SalesOrderServiceClient(myBinding, endPointAddress);
            sc.ClientCredentials.Windows.ClientCredential.UserName = "crmusername";
            sc.ClientCredentials.Windows.ClientCredential.Password = "crmpassword";

            sc.ClientCredentials.Windows.AllowedImpersonationLevel = System.Security.Principal.TokenImpersonationLevel.Impersonation;

            #endregion

            #region "Create Sales Order"

            // Obtain the execution context from the service provider.
            IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext)); //getting error because serviceProvider is null

My .config file is as below.

<configuration><configSections></configSections><system.serviceModel><bindings><basicHttpBinding><binding name="BasicHttpBinding_SalesOrderService" closeTimeout="00:01:00"
                    openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                    allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
                    maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
                    messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
                    useDefaultWebProxy="true"><readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
                        maxBytesPerRead="4096" maxNameTableCharCount="16384" /><security mode="TransportCredentialOnly"><transport clientCredentialType="Ntlm" proxyCredentialType="None"
                            realm="" /><message clientCredentialType="UserName" algorithmSuite="Default" /></security></binding></basicHttpBinding></bindings><client><endpoint address="http://<<myaxurl>>/MicrosoftDynamicsAXAif50/salesorderservice.svc"
                binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_SalesOrderService"
                contract="AXServiceReference.SalesOrderService" name="BasicHttpBinding_SalesOrderService" /></client></system.serviceModel></configuration>

Please help.