private bool doAbort = false;
 
		private void Form1_Load(object sender, System.EventArgs e){
			this.KeyPreview = true;
		}
 
		private void button1_Click(object sender, System.EventArgs e){
			this.doAbort = false;
			someMethode();
		}
 
		private void button2_Click(object sender, System.EventArgs e){
			this.doAbort = true;
		}
 
		private void Form1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs _
  e){
			this.doAbort = (e.KeyCode == System.Windows.Forms.Keys.Escape); 		
		}
 
		private void someMethode(){
			while (!this.doAbort){
				System.Diagnostics.Debug.WriteLine (DateTime.Now.ToString());
				System.Threading.Thread.Sleep (100);
				System.Windows.Forms.Application.DoEvents();
			}
			System.Diagnostics.Debug.WriteLine ("Abort!");
		}