Passing Json data to WCF rest Service

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ASP.NET

WCF

JSON

REST

Hi,

In my aspx page
I wrote code

DataContractJsonSerializer serial = new DataContractJsonSerializer(typeof(CreateDoctorProfileArg));
MemoryStream memory = new MemoryStream();
serial.WriteObject(memory, doctorArgs);
string data = Encoding.UTF8.GetString(memory.ToArray(), 0, (int)memory.Length);

WebClient webClient = new WebClient();
webClient.Headers[HttpRequestHeader.ContentType] = "application/json";
webClient.Encoding = Encoding.UTF8;

webClient.UploadString(url + "/CreateDoctorProfile", "POST", data)

At the end I am getting the following error.

"The remote server returned an error: (500) Internal Server Error."

Please explain me how to reduce the problem