public delegate void DelegateProgress();

    
  protected void Button1_Click(object sender,EventArgs e){  
    ...  
    DelegateProgress Press = new DelegateProgress(MyFunction);    
    IAsyncResult result = team_Press.BeginInvoke(null, null);    
    ...    
  }  
  protected void MyFunction()    
  {    
    ...    
  }