upgrade code from crm 4 to crm 5

am trying to upgrade code from ms crm 4 to crm 2011, but I have some issues...

where has CrmService and MetadataService class gone ?

tried to ref

using Microsoft.Xrm.Sdk;
u开发者_StackOverflowsing Microsoft.Xrm.Sdk.Metadata;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Client;
using Microsoft.Crm.Sdk;

They are now bundled into one service called the OrganizationService.