<ExtensionAttribute()>
Public Overloads Shared Function AsScalarAsync(Of T)( _
   ByVal query As IEntityQuery(Of T) _
) As IEntityScalarQuery(Of T)

Dim query As IEntityQuery(Of T)
Dim value As IEntityScalarQuery(Of T)
 
value = EntityQueryExtensions.AsScalarAsync(Of T)(query)

[ExtensionAttribute()]
public static IEntityScalarQuery<T> AsScalarAsync<T>( 
   IEntityQuery<T> query
)

[ExtensionAttribute()]
public:
static IEntityScalarQuery<T^>^ AsScalarAsyncgeneric<typename T>
( 
   IEntityQuery<T^>^ query
) 

var mgr = new DomainModelEntityManager();

var query = mgr.Customers.AsScalarAsync();
var op = query.FirstOrDefault();
op.Completed += (o, args) => {
  var cust = args.Result;
};