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Note : The code in this question is part of deSleeper if you want the full source. One of the things I wanted out of commands was a baked design for asynchronous operations. I wanted the button pressed to disable while the command was executing, and come back when complete. I wanted the actual work to be performed in a ThreadPool work item. And lastly, I wanted a way to handle any errors that occurred during the asynchronous processing. My solution was an AsyncCommand: public abstract class AsyncCommand : ICommand { public event EventHandler CanExecuteChanged; public event EventHandler ExecutionStarting; public event EventHandler<AsyncCommandCompleteEventArgs> ExecutionComplete; public abstract string Text { get; } private bool _isExecuting; public bool IsExecuting { get { return _isExecuting; } private set { _isExecuting = value; if (CanExecuteChanged != null) CanExecuteChanged(this, EventArgs.Empty); } } protected abstract void OnExecute(object parameter); public void Execute(object parameter) { try { IsExecuting = true; if (ExecutionStarting != null) ExecutionStarting(this, EventArgs.Empty); var dispatcher = Dispatcher.CurrentDispatcher; ThreadPool.QueueUserWorkItem( obj => { try { OnExecute(parameter); if (ExecutionComplete != null) dispatcher.Invoke(DispatcherPriority.Normal, ExecutionComplete, this, new AsyncCommandCompleteEventArgs(null)); } catch (Exception ex)

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