如何让webservice支持http.get调用

用C#写的web service，一个标准和Demo，可以支持http.post调用，但是不支持http.get调用，是什么原因呢，要在哪里加什么配置吗？请给个答案吧，谢谢！
代码如下，非常简单，就是新建工程后的代码，只是想测试一下get调用的效果：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;

namespace WebService1
{
    /// <summary>
    /// Service1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
    // [System.Web.Script.Services.ScriptService]
    public class Service1 : System.Web.Services.WebService
    {

        [WebMethod]
        public string HelloWorld(string name)
        {
            return name + "Hello World";
        }
    }
} --------------------编程问答-------------------- [ServiceContract]
public interface IService1
{
   [OperationContract]
   [WebGet(UriTemplate="Add/{x}/{y}",ResponseFormat=WebMessageFormat.Xml)]
   int Add(string x, string y);
}

*****************************************************************************
签名档： http://feiyun0112.cnblogs.com/ --------------------编程问答--------------------



// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。

// [System.Web.Script.Services.ScriptService]

这不是说了么...把注释弄掉就可以通过Jquery的ajax来调用webservice了.

--------------------编程问答-------------------- 是可以调用了，但是为什么只能这样调http://localhost/myweb/Service1.asmx?op=HelloWorld&name=1123
不能http://localhost/myweb/Service1.asmx/HelloWorld?name=1123
？
然后返回的值是整个一个html不是我要的效果呀

<html>

    <head><link rel="alternate" type="text/xml" href="/myweb/Service1.asmx?disco" />

    <style type="text/css">

BODY { color: #000000; background-color: white; font-family: Verdana; margin-left: 0px; margin-top: 0px; }
#content { margin-left: 30px; font-size: .70em; padding-bottom: 2em; }
A:link { color: #336699; font-weight: bold; text-decoration: underline; }
A:visited { color: #6699cc; font-weight: bold; text-decoration: underline; }
A:active { color: #336699; font-weight: bold; text-decoration: underline; }
A:hover { color: cc3300; font-weight: bold; text-decoration: underline; }
P { color: #000000; margin-top: 0px; margin-bottom: 12px; font-family: Verdana; }
pre { background-color: #e5e5cc; padding: 5px; font-family: Courier New; font-size: x-small; margin-top: -5px; border: 1px #f0f0e0 solid; }
td { color: #000000; font-family: Verdana; font-size: .7em; }
h2 { font-size: 1.5em; font-weight: bold; margin-top: 25px; margin-bottom: 10px; border-top: 1px solid #003366; margin-left: -15px; color: #003366; }
h3 { font-size: 1.1em; color: #000000; margin-left: -15px; margin-top: 10px; margin-bottom: 10px; }
ul { margin-top: 10px; margin-left: 20px; }
ol { margin-top: 10px; margin-left: 20px; }
li { margin-top: 10px; color: #000000; }
font.value { color: darkblue; font: bold; }
font.key { color: darkgreen; font: bold; }
font.error { color: darkred; font: bold; }
.heading1 { color: #ffffff; font-family: Tahoma; font-size: 26px; font-weight: normal; background-color: #003366; margin-top: 0px; margin-bottom: 0px; margin-left: -30px; padding-top: 10px; padding-bottom: 3px; padding-left: 15px; width: 105%; }
.button { background-color: #dcdcdc; font-family: Verdana; font-size: 1em; border-top: #cccccc 1px solid; border-bottom: #666666 1px solid; border-left: #cccccc 1px solid; border-right: #666666 1px solid; }
.frmheader { color: #000000; background: #dcdcdc; font-family: Verdana; font-size: .7em; font-weight: normal; border-bottom: 1px solid #dcdcdc; padding-top: 2px; padding-bottom: 2px; }
.frmtext { font-family: Verdana; font-size: .7em; margin-top: 8px; margin-bottom: 0px; margin-left: 32px; }
.frmInput { font-family: Verdana; font-size: 1em; }
.intro { margin-left: -15px; }

    </style>

    <title>
Service1 Web 鏈嶅姟
</title></head>

  <body>

    <div id="content">

      <p class="heading1">Service1</p><br>





      <span>
          <p class="intro">鍗曞嚮<a href="Service1.asmx">姝ゅ</a>锛岃幏鍙栧畬鏁寸殑鎿嶄綔鍒楄〃銆?/p>
          <h2>HelloWorld</h2>
          <p class="intro"></p>

          <h3>娴嬭瘯</h3>

          鑻ヨ浣跨敤 HTTP POST 鍗忚瀵规搷浣滆繘琛屾祴璇曪紝璇峰崟鍑烩€滆皟鐢ㄢ€濇寜閽€?

                      <form target="_blank" action='http://localhost/myweb/Service1.asmx/HelloWorld' method="POST">

                          <table cellspacing="0" cellpadding="4" frame="box" bordercolor="#dcdcdc" rules="none" style="border-collapse: collapse;">
                          <tr>
<td class="frmHeader" background="#dcdcdc" style="border-right: 2px solid white;">鍙傛暟</td>
<td class="frmHeader" background="#dcdcdc">鍊?/td>
</tr>


                          <tr>
                            <td class="frmText" style="color: #000000; font-weight: normal;">name:</td>
                            <td><input class="frmInput" type="text" size="50" name="name"></td>
                          </tr>

                        <tr>
                          <td></td>
                          <td align="right"> <input type="submit" value="璋冪敤" class="button"></td>
                        </tr>
                        </table>


                    </form>
                  <span>
              <h3>SOAP 1.1</h3>
              <p>浠ヤ笅鏄?SOAP 1.2 璇锋眰鍜屽搷搴旂ず渚嬨€傛墍鏄剧ず鐨?font class=value>鍗犱綅绗?/font>闇€鏇挎崲涓哄疄闄呭€笺€?/p>

              <pre>POST /myweb/Service1.asmx HTTP/1.1
Host: localhost
Content-Type: text/xml; charset=utf-8
Content-Length: <font class=value>length</font>
SOAPAction: "http://tempuri.org/HelloWorld"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <HelloWorld xmlns="http://tempuri.org/">
      <name><font class=value>string</font></name>
    </HelloWorld>
  </soap:Body>
</soap:Envelope></pre>

              <pre>HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: <font class=value>length</font>

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <HelloWorldResponse xmlns="http://tempuri.org/">
      <HelloWorldResult><font class=value>string</font></HelloWorldResult>
    </HelloWorldResponse>
  </soap:Body>
</soap:Envelope></pre>
          </span>

          <span>
              <h3>SOAP 1.2</h3>
              <p>浠ヤ笅鏄?SOAP 1.2 璇锋眰鍜屽搷搴旂ず渚嬨€傛墍鏄剧ず鐨?font class=value>鍗犱綅绗?/font>闇€鏇挎崲涓哄疄闄呭€笺€?/p>

              <pre>POST /myweb/Service1.asmx HTTP/1.1
Host: localhost
Content-Type: application/soap+xml; charset=utf-8
Content-Length: <font class=value>length</font>

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <HelloWorld xmlns="http://tempuri.org/">
      <name><font class=value>string</font></name>
    </HelloWorld>
  </soap12:Body>
</soap12:Envelope></pre>

              <pre>HTTP/1.1 200 OK
Content-Type: application/soap+xml; charset=utf-8
Content-Length: <font class=value>length</font>

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <HelloWorldResponse xmlns="http://tempuri.org/">
      <HelloWorldResult><font class=value>string</font></HelloWorldResult>
    </HelloWorldResponse>
  </soap12:Body>
</soap12:Envelope></pre>
          </span>



          <span>
              <h3>HTTP POST</h3>
              <p>浠ヤ笅鏄?HTTP POST 璇锋眰鍜屽搷搴旂ず渚嬨€傛墍鏄剧ず鐨?font class=value>鍗犱綅绗?/font>闇€鏇挎崲涓哄疄闄呭€笺€?/p>

              <pre>POST /myweb/Service1.asmx/HelloWorld HTTP/1.1
Host: localhost
Content-Type: application/x-www-form-urlencoded
Content-Length: <font class=value>length</font>

<font class=key>name</font>=<font class=value>string</font></pre>

              <pre>HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: <font class=value>length</font>

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/"><font class=value>string</font></string></pre>
          </span>
      </span>
  </body>
</html>

补充：.NET技术 ,  Web Services