The remote server returned an error 405 method not allowed

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C#

WCFServices

I am creating WCF Restful service,I have followed this link.

The service is created without any error, but when I am calling it from C#, its giving me error method not allowed.

What I have tried:

I tried using

[WebGet(UriTemplate = "GetData/")]

and

[WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json, UriTemplate = "GetData/")]

but same error in both cases
This is how I am using in C#

DataContractJsonSerializer objseria = new DataContractJsonSerializer(typeof(string));
           MemoryStream mem = new MemoryStream();
           //objseria.WriteObject(mem, stu);
           string data = Encoding.UTF8.GetString(mem.ToArray(), 0, (int)mem.Length);
           WebClient webClient = new WebClient();
           webClient.Headers["Content-type"] = "application/json";
           webClient.Encoding = Encoding.UTF8;
           webClient.UploadString("http://localhost:5025/MyService.svc/getdata/", "POST", data);

I tried changing the above code to this

WebClient proxy = new WebClient();
           byte[] abc = proxy.DownloadData((new Uri("http://localhost:5025/Accounts.svc/getdata/")));
           Stream strm = new MemoryStream(abc);
           DataContractSerializer obj = new DataContractSerializer(typeof(string));

           string result = obj.ReadObject(strm).ToString();

but I am getting below error in above code
"

There was an error deserializing the object of type System.String. The data at the root level is invalid. Line 1, position 1.

"

I am not getting any XML to check the error.