CancellationToken.ThrowIfCancellationRequested Method    
Definition
Important
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Throws a OperationCanceledException if this token has had cancellation requested.
public:
 void ThrowIfCancellationRequested();public void ThrowIfCancellationRequested();member this.ThrowIfCancellationRequested : unit -> unitPublic Sub ThrowIfCancellationRequested ()Exceptions
The token has had cancellation requested.
Remarks
This method provides functionality equivalent to:
C#
if (token.IsCancellationRequested)   
    throw new OperationCanceledException(token);  
If token.IsCancellationRequested Then  
    Throw New OperationCanceledException(token)  
End If