I have the following web method that I wish to call through jquery-ajax.\[code\][System.Web.Services.WebMethod]public static int saveDataToServer(string cntName, string cntEmail, string cntMsg){ // Implementation}\[/code\]This is my jquery ajax calling method...\[code\] function makeAjaxCall(arrOfObjName, arrOfObjValues, urlToCall) { debugger; var tempData; // Check if objNames's length is same as objValues's length. if (arrOfObjName.length != arrOfObjValues.length) { return null; } var dataString = ""; // Building data object, we know the two arrays have same length! for (var intIndex = 0; intIndex < arrOfObjName.length; ++intIndex) { if (intIndex == arrOfObjName.length - 1) { dataString += arrOfObjName[intIndex] + ":" + arrOfObjValues[intIndex]; continue; } dataString += arrOfObjName[intIndex] + ":" + arrOfObjValues[intIndex] + ","; } $.ajax({ type: "POST", url: urlToCall, contentType: "application/json; charset=utf-8", data: JSON.stringify("{" + dataString + "}"), dataType: "json", success: function (data) { tempData = http://stackoverflow.com/questions/15711211/data; }, error: function (data) { tempData = null; } }); return tempData; }\[/code\]Before calling the method, I'm passing it arrays,\[code\] var arrOfObjects = new Array("cntName", "cntEmail", "cntMsg"); var arrOfObjectVals = new Array($(cntName).val(),$(cntEmail).val(),$(cntMsg).val());\[/code\]But when the actual call happens, I get the following error in Fiddler.\[code\]{"Message":"Cannot convert object of type \u0027System.String\u0027 to type \u0027System.Collections.Generic.IDictionary`2[System.String,System.Object]\u0027","StackTrace":" at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object\u0026 convertedObject)\r\n at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object\u0026 convertedObject)\r\n at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)\r\n at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)\r\n at System.Web.Script.Services.RestHandler.GetRawParamsFromPostRequest(HttpContext context, JavaScriptSerializer serializer)\r\n at System.Web.Script.Services.RestHandler.GetRawParams(WebServiceMethodData methodData, HttpContext context)\r\n at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}\[/code\]I assume that the method is having problems converting the "string type data" to a dictionary. But why so in the first place? Can I not build the data that I wish to pass to the web-method dynamically ?Updated as requested : \[code\]>> JSON.stringify("{" + dataString + "}")""{cntName:asdasdasd,cntEmail:[email protected],cntMsg:saveDataToServersaveDataToServersaveDataToServersaveDataToServersaveDataToServersaveDataToServersaveDataToServer}""\[/code\]