AsyncWorker - A Typesafe BackgroundWorker (and about Threading in General)

using System;
using System.Drawing;
using System.Windows.Forms;

namespace AsyncWorkerCs {
   public partial class uclAsyncWorker : UserControl {
      
      private AsyncWorker _Worker = new AsyncWorker();
      
      public uclAsyncWorker() {
         InitializeComponent();
         _Worker.IsRunningChanged += (s, e) => UpdateGui();
         UpdateGui();
      }
      
      private void UpdateGui() {
         btCancel.Visible = progressBar1.Visible = _Worker.IsRunning;
         if(_Worker.IsRunning) {
            this.MouseDown -= ucl_MouseDown;
            progressBar1.Value = 0;
         } else { this.MouseDown += ucl_MouseDown; }
      }
      
      void ucl_MouseDown(object sender, MouseEventArgs e) {
         _Worker.RunAsync(EvaluateData, DateTime.Now, e.Location);
      }
      
      private void EvaluateData(DateTime t, Point p) {
         for(var i = 0; i < 300; i++) {
            System.Threading.Thread.Sleep(10);
            //reports a progress only if the previous one was more than 0.3s ago
            //ReportProgress()==false indicates the process is canceled.
            if(!_Worker.ReportProgress(() => progressBar1.Value = i / 3))return;
         }
         var s = string.Format("Position {0} / {1}\nclicked at {2:T}", p.X, p.Y, t);
         _Worker.NotifyGui(DisplayResult, s, p);
      }
      
      private void DisplayResult(string s, Point p) {
         label1.Text = s;
         label1.Location = p - label1.Size;
      }
      
      private void btCancel_Click(object sender, EventArgs e) {
         _Worker.Cancel();
         label1.Text = "Canceled";
      }
 
   }
}