如何使用jQuery调用C＃方法？

Question

I want a C# code behind to be run every second. After googling, I wrote these codes:

    <script type="text/javascript">
        var myVar = setInterval(function () { start() }, 1000);
        function start() {
                time2 = 5;
                //alert("Hello");
                $.ajax({
                    type: "POST",
                    url: "WebForm1.aspx/refresh",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function () {
                        alert("Hello");
                    },
                    failure: function () {
                        alert("Error");
                    }
                });
        }
    </script>

And the code behind is:

    [System.Web.Services.WebMethod]
    public static void refresh()
    {
         //some code
    }

But nothing happens. What's wrong?

UPDATE: I installed Firebug and observed that it is reporting "500 Internal Server Error". What does it mean ?

Answer 1

Everything looks good. But i assume you are not calling the JavaScript function.

<script type="text/javascript">
        var myVar = setInterval(function () { start() }, 1000);
        function start() {
            alert('hi');
            time2 = 5;
            //alert("Hello");
            $.ajax({
                type: "POST",
                url: "default.aspx/refresh",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function () {
                    alert("Hello");
                },
                failure: function () {
                    alert("Error");
                }
            });
        }


        myVar;   //------------------> Call the function
    </script>

just call the function by calling myVar;