invalid web service call missing value for parameter

I am calling a Webmethod via jquery ajax call.

Here is my ajax method = true;
            type: "GET",
            url: "mypage.aspx/GetConnectionDetail", 
            contentType: "application/json; charset=utf-8",
            data: JSON.stringify({ "Id": Id, "accountKey": accountKey, "securityKey": securityKey, "connectionGUID": connectionGUID }),
            dataType: "json",

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Here is my c# web method
[ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
  public static string GetConnectionDetail(string Id, string accountKey, string securityKey, string connectionGUID)
            return "my connection";

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When i am calling this method via POST Request it works fine but as i start calling the same method via GET request i am getting
invalid web service call missing value for parameter u0027/Id/u0027
. I debug my jquery function for missing parameters but the parameter is not missing. and if i switch to POST request it works fine.
Rohit SharmaAsked:
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Chris StanyonWebDevCommented:
My guess here is that you are trying to JSONify your data for a GET request. No need - a GET request should be passed as a querystring. Just use the data argument like so:

data: {
    "Id": Id,
    "accountKey": accountKey,
    "securityKey": securityKey,
    "connectionGUID": connectionGUID

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jQuery will then automatically create the querystring for you.
Rohit SharmaAuthor Commented:
Thanks for your reply Chris Stanyon

this will not work as it throw a error  
Invalid JSON primitive
Chris StanyonWebDevCommented:
Ok. I think you need to remove the contentType  argument from your AJAX call as you're no longer sending it across as JSON. Remove this line:

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

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