ASP.NET

window.open(url, 'Download', 'height=1,width=1,top=0,left=-1000');

namespace immu.control
{
    [ToolboxData("<{0}:myControl runat=server></{0}:myControl>")]
    public class docControl : WebControl
    {

        public Button btn;

        protected override void CreateChildControls()
        {
            Panel pnl = new Panel();
            btn = new Button();
            btn.Text = "Click Me";
            btn.Click += new EventHandler(btn_Click);
            pnl.Controls.Add(btn);
            this.Controls.Add(pnl);
            //base.CreateChildControls();
        }

        public void btn_Click(object sender, EventArgs e)
        {
            HttpContext.Current.Response.Redirect("http://google.com");
        }
    }
}