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copied!<p>hi use a backgroundworker it allows you to follow the status of work (progress event), completed event and you can cancel it</p> <pre><code> using System; using System.Threading; using System.ComponentModel; class Program { static BackgroundWorker _bw; static void Main() { _bw = new BackgroundWorker { WorkerReportsProgress = true, WorkerSupportsCancellation = true }; _bw.DoWork += bw_DoWork; _bw.ProgressChanged += bw_ProgressChanged; _bw.RunWorkerCompleted += bw_RunWorkerCompleted; _bw.RunWorkerAsync ("Hello to worker"); Console.WriteLine ("Press Enter in the next 5 seconds to cancel"); Console.ReadLine(); if (_bw.IsBusy) _bw.CancelAsync(); Console.ReadLine(); } static void bw_DoWork (object sender, DoWorkEventArgs e) { for (int i = 0; i <= 100; i += 20) { if (_bw.CancellationPending) { e.Cancel = true; return; } _bw.ReportProgress (i); Thread.Sleep (1000); // Just for the demo... don't go sleeping } // for real in pooled threads! e.Result = 123; // This gets passed to RunWorkerCompleted } //here set your scanner work static void bw_RunWorkerCompleted (object sender, RunWorkerCompletedEventArgs e) { if (e.Cancelled) Console.WriteLine ("You canceled!"); else if (e.Error != null) Console.WriteLine ("Worker exception: " + e.Error.ToString()); else Console.WriteLine ("Complete: " + e.Result); // from DoWork } static void bw_ProgressChanged (object sender, ProgressChangedEventArgs e) { Console.WriteLine ("Reached " + e.ProgressPercentage + "%"); } } </code></pre>

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