///这个是拿别人的，找到好多这个方法，溜了，不知道谁是原创

protected void btnPrint_Click(object sender, EventArgs e)
        {
            string url = "QR_CodePrintView.aspx?Code=" + tbAssetCode.Text + ";";
            Redirect(Response, url, "_blank", "'toolbar=0,scrollbars=1,status=0,menubar=0,resizable=1,top=0,left=0,height=800,width=1000");
        }
        /// <summary>
        /// 打开新的标签页
        /// </summary>
        /// <param name="response"></param>
        /// <param name="url"></param>
        /// <param name="target"></param>
        /// <param name="windowFeatures"></param>
        private void Redirect(HttpResponse response, string url, string target, string windowFeatures)
        {
            if ((String.IsNullOrEmpty(target) || target.Equals("_self", StringComparison.OrdinalIgnoreCase)) && String.IsNullOrEmpty(windowFeatures))
            {
                response.Redirect(url);
            }
            else
            {
                Page page = (Page)HttpContext.Current.Handler;
                if (page == null)
                {
                    throw new
                    InvalidOperationException("Cannot redirect to new window .");
                }
                url = page.ResolveClientUrl(url);
                string script;
                if (!String.IsNullOrEmpty(windowFeatures))
                {
                    script = @"window.open(""{0}"", ""{1}"", ""{2}"");";
                }
                else
                {
                    script = @"window.open(""{0}"", ""{1}"");";
                }
                script = String.Format(script, url, target, windowFeatures);
                ScriptManager.RegisterStartupScript(page, typeof(Page), "Redirect", script, true);
            }
        }