C#

public void StartRecalculation() {<br />
try {<br />
FillArrayList();<br />
for ( int num = 0; num < m_Manifest.Count; num++ ) {<br />
// Task IDs are Guids.<br />
Guid taskId = Guid.NewGuid();<br />
<br />
// Start the asynchronous task.<br />
this.CalculateStartAsync( Int32.Parse( m_Manifest[ num ].ToString() ), taskId );<br />
} // end of for loop.<br />
} // end of try<br />
catch ( Exception ex ) {<br />
AddToErrorReport( ex.ToString() );<br />
}// end of catch<br />
} // end of StartRecalculation<br />
<br />
public void CalculateStartAsync( int _ticket, object taskId ) {<br />
// Create an AsyncOperation for taskId.<br />
AsyncOperation asyncOp = AsyncOperationManager.CreateOperation( taskId );<br />
<br />
// Multiple threads will access the task dictionary,<br />
// so it must be locked to serialize access.<br />
lock ( userStateToLifetime.SyncRoot ) {<br />
if ( userStateToLifetime.Contains( taskId ) ) {<br />
throw new ArgumentException( "Task ID parameter must be unique", "taskId" );		<br />
} // end of userStateToLifetime.Contains( taskId )<br />
<br />
userStateToLifetime[ taskId ] = asyncOp;<br />
} // end of lock this<br />
<br />
// Start the asynchronous operation.<br />
WorkerEventHandler workerDelegate = new WorkerEventHandler( CalculateWorker );<br />
workerDelegate.BeginInvoke( _ticket, asyncOp, null, null );<br />
} //end of CalculateStartAsync<br />