CommunicationObject::BeginOpen Method (TimeSpan, AsyncCallback^, Object^)


Begins an asynchronous operation to open a communication object within a specified interval of time.

Namespace:   System.ServiceModel.Channels
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

virtual IAsyncResult^ BeginOpen(
	TimeSpan timeout,
	AsyncCallback^ callback,
	Object^ state
) sealed


Type: System::TimeSpan

The TimeSpan that specifies how long the send operation has to complete before timing out.

Type: System::AsyncCallback^

The AsyncCallback delegate that receives notification of the completion of the asynchronous open operation.

Type: System::Object^

An object, specified by the application, that contains state information associated with the asynchronous open operation.

Return Value

Type: System::IAsyncResult^

The IAsyncResult that references the asynchronous open operation.

Exception Condition

The communication object is not in a Opened or Opening state and cannot be modified.


The communication object is in a Closing or Closed state and cannot be modified.


The communication object is in a Faulted state and cannot be modified.


The default interval of time that was allotted for the operation was exceeded before the operation was completed.

The BeginOpen(TimeSpan, AsyncCallback^, Object^) method calls OnOpening and OnBeginOpen(TimeSpan, AsyncCallback^, Object^) if the communication object is initially in the Created state.

To insert processing after a communication object transitions to a closing state due to the invocation of a synchronous Open operation, use the Open method.

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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