请 for (int i = 0; i < txtUrls.Length; i++)
            {
                try
                {
                    WatiN.Core.DialogHandlers.AlertDialogHandler dh = new WatiN.Core.DialogHandlers.AlertDialogHandler();

                    using (IE ie = new IE(txtUrls[i]))    //调用URL，txtUrls[i]为Url地址
                    {
                        ie.AddDialogHandler(dh);//增加一个控制句柄

                        ie.CheckBox("cblSets_6").Checked = false;
                        ie.CheckBox("cblSets_8").Checked = true;                       
                        ie.Button("btnSave").ClickNoWait();   //执行保存
                        ie.RemoveDialogHandler(dh);
                        ie.Close();
                    }
                }
                catch (Exception e)
                {
                    sb.Append("Execute Err:").Append(txtUrls[i]).Append(";");
                }              
            }