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

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

namespace AsyncWorkerCs {
   public partial class uclBgwSimple : UserControl {

      public uclBgwSimple() { InitializeComponent(); }

      struct Data2Thread {
         public DateTime Time;
         public Point Pt;
      }
      struct Data2Gui {
         public string Text;
         public Point Pt;
      }

      private void ucl_MouseDown(object sender, MouseEventArgs e) {
         if(backgroundWorker1.IsBusy) {
            MessageBox.Show("backgroundWorker1.IsBusy");
            return;
         }
         Data2Thread d = new Data2Thread() { Time = DateTime.Now, Pt = e.Location };
         backgroundWorker1.RunWorkerAsync(d);
      }

      private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) {
         Data2Thread d = (Data2Thread)e.Argument;           
         System.Threading.Thread.Sleep(1000);
         Data2Gui d2g = new Data2Gui() {
            Pt = d.Pt,
            Text = string.Format("Position {0} / {1}\nclicked at {2:T}", d.Pt.X, d.Pt.Y, d.Time)
         };
         e.Result = d2g;
      }

      private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
         Data2Gui d2g = (Data2Gui)e.Result;
         label1.Text = d2g.Text;
         label1.Location = d2g.Pt - label1.Size;
      }

   }
}