[讨论] 连接数据库后为什么返回null值？

连接数据库后为什么返回null值，测试数据库查询没有问题。请帮忙看一下是哪的问题。如果是异步的问题，请问应该如何设置引擎？
  谢谢了。
  <script language = "javascript">
  var request = false;
                        try {
                        request = new XMLHttpRequest();
                        } catch (trymicrosoft) {
                        try {
                        request = new ActiveXObject("Msxml2.XMLHTTP");
                        } catch (othermicrosoft) {
                        try {
                        request = new ActiveXObject("Microsoft.XMLHTTP");
                        } catch (failed) {
                        request = false;
                        }
                        }
                        }
                        if (!request)
                        alert("Error initializing XMLHttpRequest!");

                        function add() {

                        request.open("GET", "http://localhost/spKey/EuKey.aspx", true);
                        request.onreadystatechange = processRequest;
                        request.send(null);
                        }

   function processRequest(){

                        if (request.readyState == 4){
                        if (request.status == 200){

                              var kk =EuKey.ServerSideAdd("slect * from a");
            document.Form1.txt3.value =kk.value;
} else
                        alert("status is " + request.status);
                        }

}

  服务器端：
  VB：
  <Ajax.AjaxMethod()> _
      Public Function ServerSideAdd(ByVal str As String) As String
               ...连接数据库并返回值
               Dim ss As String= 返回的值
               Return ss

      End Function

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