string endPoint = @"http://jsonplaceholder.typicode.com/posts";
var client = new RestClient(endPoint);
var json = client.MakeRequest();

try
{
    string endPoint = @"http://jsonplaceholder.typicode.com/posts/1";
    
    dynamic data = new { 
        id = 1,
        title = "foo",
        body = "bar",
        userId = 1 
    };

    var serializer = new JavaScriptSerializer();
    var json = serializer.Serialize(data);

    var client = new RestClient(endPoint, HttpVerb.PUT, "application/json", json);
    return client.MakeRequest();
}
catch (WebException webExcp) 
{
    Console.WriteLine("A WebException has been caught.");
    // Write out the WebException message.
    Console.WriteLine(webExcp.ToString());
    // Get the WebException status code.
    WebExceptionStatus status =  webExcp.Status;
    // If status is WebExceptionStatus.ProtocolError, 
    //   there has been a protocol error and a WebResponse 
    //   should exist. Display the protocol error.
    if (status == WebExceptionStatus.ProtocolError) {
        Console.Write("The server returned protocol error ");
        // Get HttpWebResponse so that you can check the HTTP status code.
        HttpWebResponse httpResponse = (HttpWebResponse)webExcp.Response;
        Console.WriteLine((int)httpResponse.StatusCode + " - "
           + httpResponse.StatusCode);
    }
}
catch (Exception e) 
{
    // Code to catch other exceptions goes here.
}