when iam passing it to handler I am getting Not found alert

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C#

ASP.NET

Javascript

jQuery

MVP

function senddescription(context){
 var desc;
desc = $.trim($("#txtDetails_" + context).val());
 var feature = "description";
var p ={'description': desc,'feature': feature}
var success = function (msg) {
.....
/*some Code*/
......
}
 var datatype = "json";
        CallHandler(m, p, success, null, null, datatype, true);
}

function CallHandler(m, p, s, e, f, t, async) {
    var asyn = false;
    if (async != undefined && (async == true || async == false))
        asyn = async;
    $.ajax({
        type: m, 
        url: "../Handler.ashx", 
        data: p,
        contentType: "application/json; charset=utf-8", 
        dataType: t, // Set return Data Type
        async: asyn,
        cache: false,
        success: s,
        error: e != null ? e : function (xhr, msg, e) {
           .....
/*error Code*/
......
        }
    });
}

I have written this code

I am passing description as 2000 charactors
when iam passing it to handler I am getting Not found alert

How to resolve that issue

[edit]Code block added[/edit]