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Call API , Return Json

Hello Expert,

I am trying to build a plugin which calling API and return web response with type Json

How could I catch the message in a specific tag

Here is the json response {"ResultMessage":"Enter a valid date ( from date is before First Hire date)","DocumentNo":0,"Result1":"","Result2":""}

When I am trying to throw the ResultMessage in an exception it gives me the following error

System.Runtime.Serialization.SerializationException: Expecting element 'root' from namespace ''.. Encountered 'None' with name '', namespace ''.

var request = WebRequest.Create(myUri);
request.Method = WebRequestMethods.Http.Post;

var response = request.GetResponse();

var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
ResultMessage refundResponse = new ResultMessage();
DataContractJsonSerializer deserializer = new DataContractJsonSerializer(typeof(ResultMessage));
MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(responseString));
ResultMessage R = deserializer.ReadObject(ms) as ResultMessage;
refundResponse = deserializer.ReadObject(response.GetResponseStream()) as ResultMessage;

throw new InvalidPluginExecutionException(refundResponse.ResultMessage);

[DataContract]
public class ResultMessage
{
[DataMember(Name = "resultmessage")]

public string ResultMessage { get; set; }
[DataMember]
public string Result1 { get; set; }
[DataMember]
public string Result2 { get; set; }
[DataMember]
public int DocumentNo { get; set; }
}

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