HTTP传递读取数据

//HTTP传递读取数据 
前台
//初始化HTTP對象
function GetXmlHttpRequest()
{
    var A=null;
    try
    {
        A=new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch(e)
    {
        try
        {
            A=new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch(oc)
        {
            A=null;
        }
    }
    if(!A && typeof XMLHttpRequest != "undefined")
    {
        A=new XMLHttpRequest();
    }
    return A;
 }
   
  
 //用HTTP方式绑定下拉框
 function GetHTTP()
 {
   document.getElementById("dpHttp").options.length=0;
    var xmlhttp = GetXmlHttpRequest();
   var weburl="Default.aspx?senderCtl=Http_string";
       xmlhttp.open("Post",weburl,false);
       xmlhttp.send("");
   var returns=xmlhttp.responseText;  
    if(returns!=""&&returns!=null)
    {
      var tempxmlRtn=returns.replace('<ID>','').replace('</ID>','');
      var arrayList =tempxmlRtn.split("**");
      var arrayValue =new Array();
      for(i=0;i<arrayList.length;i++)    
      {       
       arrayValue=arrayList[i].split("##");         
       document.getElementById("dpHttp").options[i+1]=new Option(arrayValue[1],arrayValue[0]);
         arrayValue[0]="";arrayValue[1]="";
      }   
      document.getElementById("dpHttp").options[0]=new Option("","");
      document.getElementById("dpHttp").value="";
    }
 }

//后台
 private string GetHttp_string()
    {
        string strValue = "<ID>";
        string strLink = "";
        DataTable Http_dt = this.Setdt();

        for(int i=0;i<Http_dt.Rows.Count;i++)
        {
            strValue += strLink;
            strValue += Http_dt.Rows[i]["ID"] .ToString()+ "##";
            strValue+= Http_dt.Rows[i]["VALUE"].ToString();  
            strLink = "**";  
        }  

        strValue += "</ID>";  
        Response.Write(strValue );  
        Response.Flush();  
        Response.Close();  
    }