Initiates the asynchronous execution of the DescribePipelines operation.
            
 Declaration Syntax
 Declaration Syntax| C# | 
IAsyncResult BeginDescribePipelines( DescribePipelinesRequest describePipelinesRequest, AsyncCallback callback, Object state )
 Parameters
 Parameters- describePipelinesRequest (DescribePipelinesRequest)
- Container for the necessary parameters to execute the DescribePipelines operation on AmazonDataPipeline.
- callback (AsyncCallback)
- An AsyncCallback delegate that is invoked when the operation completes.
- state (Object)
- A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback procedure using the AsyncState property.
 Return Value
 Return ValueAn IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking EndDescribePipelines
                    operation.