JSON and JSON-RPC for .NET ...

A developer creates a helloworld.ashx that contains your server side logic:
PLAIN TEXT
C#:

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      <%@ WebHandler Class="JayrockWeb.HelloWorld" %>
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      namespace JayrockWeb
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      {
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          using System;
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          using System.Web;
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          using Jayrock.Json;
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          using Jayrock.JsonRpc;
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          using Jayrock.JsonRpc.Web;
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          public class HelloWorld : JsonRpcHandler
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          {
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              [ JsonRpcMethod("greetings") ]
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              public string Greetings()
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              {
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                  return "Welcome to Jayrock!";
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              }
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          }
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      }
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Then you can access the file asking for a proxy via helloworld.ashx?proxy and you will see a test page. From code you can now:
PLAIN TEXT
JAVASCRIPT:

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          var s = new HelloWorld();
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          alert("sync:" + s.greetings());
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          s.greetings(function(response) {
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            alert("async:" + response.result)
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          });
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 Original Source:
http://ajaxian.com/