<ExtensionAttribute()>
Public Overloads Shared Function Where( _
   ByVal source As ITypedEntityQuery, _
   ByVal predicateDescription As IPredicateDescription _
) As ITypedEntityQuery

Dim source As ITypedEntityQuery
Dim predicateDescription As IPredicateDescription
Dim value As ITypedEntityQuery
 
value = EntityQueryExtensions.Where(source, predicateDescription)

[ExtensionAttribute()]
public static ITypedEntityQuery Where( 
   ITypedEntityQuery source,
   IPredicateDescription predicateDescription
)

[ExtensionAttribute()]
public:
static ITypedEntityQuery^ Where( 
   ITypedEntityQuery^ source,
   IPredicateDescription^ predicateDescription
) 

var mgr = new DomainModelEntityManager();

var entityType = typeof(Customer);
var baseQuery = EntityQuery.Create(entityType, mgr);
var predicate = PredicateBuilder.Make(typeof(Customer), "Country", FilterOperator.StartsWith, "U");
var query = baseQuery.Where(predicate);
var list = query.Execute();