SipSubscription.BeginRefresh Method

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

'Declaration
Public Function BeginRefresh ( _
    userCallback As AsyncCallback, _
    state As Object _
) As IAsyncResult
'Usage
Dim instance As SipSubscription
Dim userCallback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult

returnValue = instance.BeginRefresh(userCallback, _
    state)

public IAsyncResult BeginRefresh(
    AsyncCallback userCallback,
    Object state
)

Parameters

• userCallback
  Type: System.AsyncCallback
  The method to be called when the asynchronous operation is completed.

• state
  Type: System.Object
  A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.

Return Value

Type: System.IAsyncResult
An IAsyncResult that references the asynchronous operation.

Exceptions

See Also

Reference

SipSubscription Class

SipSubscription Members

Microsoft.Rtc.Signaling Namespace