Page Method (calling with jQuery) returns page's whole content, not return value of method.

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ASP.NET

Ajax

jQuery

Hi we are using jquery to sending ajax requests but its returns page's content everytime.
we are using this code.
Server using .NET Framework version 2

$.ajax({
    type: "POST",
    url: "ajaxPage.aspx/testMethod",
    data: "{test:'test'}",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (result) {
        $("#span_result").html(result.d).fadeIn();
    },
    error: function (msg) {
         $("#span_result").hide();
    }
}); 

//ajaxPage.aspx.cs
[System.Web.Services.WebMethod]
public static string testMethod(string test)
{
     return test;
}