<ExtensionAttribute()>
Public Overloads Shared Function AsScalarAsync( _
   ByVal query As ITypedEntityQuery _
) As IEntityScalarQuery

Dim query As ITypedEntityQuery
Dim value As IEntityScalarQuery
 
value = EntityQueryExtensions.AsScalarAsync(query)

[ExtensionAttribute()]
public static IEntityScalarQuery AsScalarAsync( 
   ITypedEntityQuery query
)

[ExtensionAttribute()]
public:
static IEntityScalarQuery^ AsScalarAsync( 
   ITypedEntityQuery^ query
) 

var mgr = new DomainModelEntityManager();

var entityType = typeof(Customer);
var baseQuery = EntityQuery.Create(entityType, mgr);
var query = baseQuery.AsScalarAsync();
var op = query.FirstOrDefault();
op.Completed += (o, args) => {
  var cust = args.Result;
};