[System.ServiceModel.ServiceBehavior(IncludeExceptionDetailInFaults=true)] 
    public class WebDataService1 : DataService<DataSource>
    {
        public static void InitializeService(IDataServiceConfiguration config)
        {
            config.SetEntitySetAccessRule("*", EntitySetRights.All);
        }
    }

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="ServerRequests" assembly="ServerRequests" 
                   default-access="nosetter.camelcase">
  <class name="People" table="Peoples">
   
    <id name="ID" unsaved-value="0" type="System.Int32">
      <column name="Id" not-null="true" />
      <generator class="identity"/>
    </id>
    
    <property name="Name" column="Name" not-null="true" type="System.string" />
  </class>
</hibernate-mapping>

public class DataSource
    {       
        static DataSource()
        {
        }        
        
        public IQueryable< People > Peoples
        {
            get
            {
                Domain.Init();
                ISession session = Domain.CurrentSession;
               
                ICriteria criteria = session.CreateCriteria(typeof(People));

                return criteria.List< People >().AsQueryable();
            }
        }
    }