jQuery ajax

 if (nameold != option.value) {

                    nameold = option.value;

                    option.errorEle.html("<span style='color:#999'>检验中……</span>");

                  $.getJSON("AjaxService.aspx?uid=" + escape(option.value) + "", function (date) {

                        if (date.success == 0) {

                            validateSettings.succeed.run(option);

                            namestate = true;

                        } else {

                            validateSettings.error.run(option, option.prompts.error.beUsed.replace("{1}", option.value));

                            namestate = false;

                        }

                    })

                }

                else {

                    validateSettings.error.run(option, option.prompts.error.beUsed.replace("{1}", option.value));

                    namestate = false;

                }

想实现的结果是注册页面中输入会员名无刷新检验是否存在。现在我新建了AjaxService.aspx在.cs页面中获取到了该会员名，并在数据库中查找是否存在，但怎么实现查找结果返回来这个页面，有就执行validateSettings.error.run(option, option.prompts.error.beUsed.replace("{1}", option.value));
                            namestate = false;
没有就执行 if (date.success == 0) {
                            validateSettings.succeed.run(option);
                            namestate = true;

AjaxService.aspx.cs的代码

 public partial class AjaxService : System.Web