foreach (Control c in this.Controls)
            {
          //第一种情况：button在窗体上
                      Button btn = c as Button;
                if (btn != null)
                {
                    if (btn.Text == "确定")
                    { 
                        //do sth.
                    }
                }

                //第二种情况：Button在panel等容器里面
                Panel p = c as Panel;
                if (p != null)
                {
                    foreach (Control cc in p.Controls)
                    {
                        Button c_btn = c as Button;
                        if (c_btn != null)
                        {
                            if (c_btn.Text == "确定")
                            {
                                //do sth.
                            }
                        }
                        
                    }
                }
            }

------解决方案--------------------

是在同一个进程中不？同一个就是4L的方法，不再同一个进程的话，那就msdn SendMessage吧