Public Overloads Shared Function StartParallel( _
   ByVal coroutine As Func(Of CoroutineOperation,IEnumerable(Of INotifyCompleted)), _
   Optional ByVal completedHandler As Action(Of CoroutineOperation) _
) As CoroutineOperation

Dim coroutine As Func(Of CoroutineOperation,IEnumerable(Of INotifyCompleted))
Dim completedHandler As Action(Of CoroutineOperation)
Dim value As CoroutineOperation
 
value = Coroutine.StartParallel(coroutine, completedHandler)

public static CoroutineOperation StartParallel( 
   Func<CoroutineOperation,IEnumerable<INotifyCompleted>> coroutine,
   Action<CoroutineOperation> completedHandler
)

public:
static CoroutineOperation^ StartParallel( 
   Func<CoroutineOperation^,IEnumerable<INotifyCompleted^>^>^ coroutine,
   Action<CoroutineOperation^>^ completedHandler
) 

public void CoroutineSampleParallel() {

   // Start some parallel async operations.
   var op = Coroutine.StartParallel(SampleActions);

   // Listen for completion. 
   op.Completed += (s, e) => {
     MessageBox.Show(e.Notifications.Count.ToString() + " operations completed");
     // You can loop thru notifications for results from each operation.
   };
 }

 // A block of asynchronous actions to be performed in parallel.
 private IEnumerable<INotifyCompleted> SampleActions() {

   // Start a query for all customers in specified country.
   yield return _entityManager.Customers.Where(c => c.Country == "UK").ExecuteAsync();

   // Start another query for all employees.  This will run in parallel.
   yield return _entityManager.Employees.ExecuteAsync();
 }              
   
/***************************************************************************************/
// Sample 2 - passing arguments to an iterator    
   
 public void CoroutineSampleParallel2() {

   // Start some parallel async operations.
   var op = Coroutine.StartParallel(() => SampleActions2("UK"));

   // Listen for completion. 
   op.Completed += (s, e) => {
     MessageBox.Show(e.Notifications.Count.ToString() + " operations completed");
     // You can loop thru notifications for results from each operation.
   };
 }

 // A block of asynchronous actions to be performed in parallel.
 private IEnumerable<INotifyCompleted> SampleActions2(string country) {

   // Start a query for all customers in specified country.
   yield return _em1.Customers.Where(c => c.Country == country).ExecuteAsync();

   // Start another query for all employeesin specified country. This will run in parallel.
   yield return _em1.Employees.Where(e=> e.Country == country).ExecuteAsync();
 }