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How to send Json Data from Aspx page
<script type="text/javascript" >
    $(document).ready(function() {

    $("#txtTest").tokenInput("Complete.aspx", {
        theme: "facebook"
    });

    });


</script>

protected void Page_Load(object sender, EventArgs e)
{
    if (!string.IsNullOrEmpty(Request.QueryString["q"]))
    {
        string json = "[{"Id":"1","name": "Test 1"},{"Id":"2","name": "Test 2"}]";
        Response.Clear();
        Response.ContentType = "application/json; charset=utf-8";
        Response.Write(json);
        Response.End();

    }
}

[WebMethod]
    public static string Info()
    {
        JavaScriptSerializer js = new JavaScriptSerializer();
        string result = js.Serialize(new string[] { "one", "two", "three" });
        return result;
    }

<script type="text/javascript">
        $(function () {
            $("#button1").click(function () {
                $.ajax({
                    url: "Default.aspx/Info",
                    data: "{}",
                    contentType: "application/json",
                    success: function (data) {
                        alert(data.d);
                    },
                    type: "post",
                    dataType : "json"
                });
            });
        });
</script>

string json = "[{"name":"Pratik"},{"name": "Parth"}]";
  Response.Clear();
  Response.ContentType = "application/json; charset=utf-8";
  Response.Write(json);
  Response.End();

<script type="text/javascript">
        $(function () {
            $("#txt1").tokenInput("JsonPage.aspx");
        });
</script>

<body>
 <input type="text" id="txt1"/>
</body>