Creates a transaction async result to refresh an existing subscription and puts the workitem in queue. Refresh is allowed only if the current subscription state is valid. Multiple simultaneous refreshes are allowed, but not recommended for the application.

Namespace:  Microsoft.Rtc.Signaling
Assembly:  Microsoft.Rtc.Collaboration(in Microsoft.Rtc.Collaboration.dll)

Syntax

Visual Basic (Declaration) 
Public 
Function 
BeginRefresh ( _
	
userCallback 
As 
AsyncCallback, _
	
state 
As 
Object _
) 
As 
IAsyncResult
C# 
public 
IAsyncResult 
BeginRefresh(
	
AsyncCallback 
userCallback,
	
Object 
state
)
Visual C++ 
public:
IAsyncResult^ 
BeginRefresh(
	
AsyncCallback^ 
userCallback, 
	
Object^ 
state
)
JavaScript 
function 
beginRefresh(
userCallback, 
state);

Parameters

userCallback
Type: AsyncCallback
The method to be called when the asynchronous operation is completed.
state
Type: Object
A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.

Return Value

An IAsyncResult that references the asynchronous operation.

Exceptions

Exception Condition
InvalidOperationException Thrown when the current subscription signaling state is not Subscribed.

See Also