Salesforce .NET Developer Environment - Verify REST

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net; 
using System.Runtime.Serialization; 
using System.Runtime.Serialization.Json; 

namespace VerifyRESTTest
{
    class Program
    {
        // Class used for serializing the OAuth JSON response
        [DataContract]
        public class OAuthUsernamePasswordResponse
        {
            [DataMember]
            public string access_token { get; set; }
            [DataMember]
            public string id { get; set; }
            [DataMember]
            public string instance_url { get; set; }
            [DataMember]
            public string issued_at { get; set; }
            [DataMember]
            public string signature { get; set; }
        }

        private static string accessToken = "";
        private static string instanceUrl = "";

        private static void login()
        {
            string acctName = "YOUR DEVORG USERNAME";
            string acctPw = "YOUR DEVORG PASSWORD AND SECURITY TOKEN";
            string consumerKey = "YOUR OAUTH CONSUMER KEY";
            string consumerSecret = "YOUR OAUTH CONSUMER SECRET";

            // Just for testing the developer environment, we use the simple username-password OAuth flow.
            // In production environments, make sure to use a stronger OAuth flow, such as User-Agent
            string strContent = "grant_type=password" + 
                "&client_id=" + consumerKey + 
                "&client_secret=" + consumerSecret + 
                "&username=" + acctName + 
                "&password=" + acctPw;

            string urlStr = "https://login.salesforce.com/services/oauth2/token?" + strContent;

            HttpWebRequest request = WebRequest.Create(urlStr) as HttpWebRequest;
            request.Method = "POST";

            try
            {
                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
                {
                    if (response.StatusCode != HttpStatusCode.OK)
                        throw new Exception(String.Format(
                            "Server error (HTTP {0}: {1}).",
                            response.StatusCode,
                            response.StatusDescription));

                    // Parse the JSON response and extract the access token and instance URL
                    DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(OAuthUsernamePasswordResponse));
                    OAuthUsernamePasswordResponse objResponse = jsonSerializer.ReadObject(response.GetResponseStream()) as OAuthUsernamePasswordResponse;
                    accessToken = objResponse.access_token;
                    instanceUrl = objResponse.instance_url;
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("\nException Caught!");
                Console.WriteLine("Message :{0} ", e.Message);
            }
        }

        static void Main(string[] args)
        {
            login(); 
            if (accessToken != "") 
            {
                // display some current login settings
                Console.Write("Instance URL: " + instanceUrl + "\n");
                Console.Write("Access Token: " + accessToken + "\n");
                Console.Write("Press any key to continue:\n");
                Console.ReadKey();
            }
        }
    }
}