| Name | Description |
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 | AsyncCompletedEventArgs | Provides data for the asynchronous method completed event. |
 | AsyncEventArgs | Represents an asynchronous EventArgs that has members to determine whether it's raised by an asynchronous operation and get the user-defined object. |
 | AsyncOperation | Tracks the lifetime of an asynchronous operation. |
 | ExtendedAsyncCompletedEventArgs<TResult> | Provides data for the asynchronous method completion events. |
 | ExtendedAsyncResult | Represents the status of an asynchronous operation that has no return value. |
 | ExtendedAsyncResult<TResult> | Represents an asynchronous operation that can return a value. |
 | MultiComparer | Class for chained comparison of objects. |
 | OperationCanceledException | The exception that is thrown in a thread upon cancellation of an operation that the thread was executing. |