I am trying post a string to web service but I am getting this error (Google Chrome Extension Project):

jquery-2.1.1.min.js:4 POST http://localhost:49242/Service.asmx/test
500 (Internal Server Error)

Here is my ajax code:

var data = {};

data.param1 = words[0];



$.ajax({

    data: JSON.stringify({ 'data': data.param1 }),

    dataType: 'application/json',

    url: 'http://localhost:49242/Service.asmx/test',

    type: 'POST',

    contentType: 'application/json; charset=utf-8',

    success: function (result) {

        alert(result);

    },

    failure: function (errMsg) {

        alert(errMsg);

    }

});

My service:

[WebMethod]



[System.Web.Script.Services.ScriptMethod(ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)]

public string test(string param1) {

    return param1;

}

I am working on this problem about 3 days. Can you help me ?

By the way, I have a question. I am posting json variable to service with ajax(like you see), but service returning xml value. Is there a problem or [System.Web.Script.Services.ScriptMethod(ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)] this code block solving problem?