.Net REST Service Call Example

using System;
 using System.IO;
 using System.Net;
 using System.Text;
 using System.Web.Script.Serialization;
 namespace ApiManualClientSample
 {
     class Program
     {
         static void Main()
         {
             const String clientIdentifier = "Enter your client Id";
             const String clientSecret = "Enter your client secret";
             const String accessTokenEndpointUrl = "https://api.trakopolis.com/api/oauth2/token";
             const String resourceEndpoint = "https://api.trakopolis.com";
             try
             {
                 // 1. Get an access token.
                 var tokenRequest = WebRequest.Create(accessTokenEndpointUrl);
                 tokenRequest.Method = "POST";
                 tokenRequest.ContentType = "application/x-www-form-urlencoded";
                 string credentials = String.Format("{0}:{1}", clientIdentifier, clientSecret);
                 tokenRequest.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(credentials)));
                 var tokenJson = GetResponse(tokenRequest, "grant_type=client_credentials");
                 var serializer = new JavaScriptSerializer(); // This is JSON deserializer.
                 var accessToken = serializer.Deserialize<TokenInfo>(tokenJson).access_token;
                 // 2. Use access token to read something.
                 var assetsRequest = WebRequest.Create(resourceEndpoint + "/api/assets");
                 assetsRequest.Headers.Add("Authorization", "Bearer " + accessToken);
                 assetsRequest.Headers["request-type"] = "api";
                 assetsRequest.Headers["response-type"] = "application/json"; // Use JSON, you can choose XML as well.
                 assetsRequest.Headers["result-size"] = "5"; // restrict result size to 5. By default most entities have limit = 1000
                 assetsRequest.ContentType = "application/json";
                 var assets = GetResponse(assetsRequest);
                 Console.WriteLine("Assets retrieved (5 max). JSON: " + Environment.NewLine + assets);
             }
             catch (Exception exc)
             {
                 Console.WriteLine("An error occured: " + exc);
             }
             Console.WriteLine("Press any key to exit.");
             Console.ReadKey();
         }
         private static string GetResponse(WebRequest request, String postData = null)
         {
             if (!String.IsNullOrWhiteSpace(postData))
             {
                 // Get bytes of data and send it.
                 byte[] bytes = Encoding.UTF8.GetBytes(postData);
                 request.ContentLength = bytes.Length;
                 using (Stream newStream = request.GetRequestStream())
                     newStream.Write(bytes, 0, bytes.Length);
             }
             // Get response
             string responseContent;
             using (var response = (HttpWebResponse)request.GetResponse())
             {
                 var stream = response.GetResponseStream();
                 if (stream == null)
                     return null;
                 responseContent = new StreamReader(stream).ReadToEnd();
             }
             return responseContent;
         }
     }
     class TokenInfo
     {
         public String access_token { get; set; }
         // There are more properties in this class, but they are omited to make this code simple.
     }
 }