Ajax Post Data maxJsonLength property limit execeeded

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Ajax

jQuery

JSON

MVC4

Hi,

I am having problem while post large amount of data in ajax request

Check Below Code

var jsonPostData = {
    p_HTML: $("#div").html(),
    p_FromDate: $("#dpFrom").val(),
    p_ToDate: $("#dpTo").val()
}
$.ajax({
    url: "url",
    contentType: "application/json; charset=utf-8",
    type: "post",
    dataType: "json",
    data: JSON.stringify(jsonPostData),
    success: function (result) {
                },
    error: function (a, b, c) {
    }
});

The Ajax Post will Send data to controller method
like /Conroller/Method/
I Add jsonSerialization in web.confige but its not working

I also tried

<appSettings>
<add key="maxJsonLength" value="52428800" />
</appSettings>

but not working

I am getting error

Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.
Parameter name: input

Request header something like

Accept  application/json, text/javascript, */*; q=0.01
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.5
Content-Length  3566924
Content-Type    application/json; charset=utf-8

.................