c# curl or rest client

Curl.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using System.Text;
using System.IO;

namespace Website.Model
{
	public class Curl
	{
		public Response response_last;

		public class Response
		{
			public Response(HttpWebResponse response)
			{
				if (response == null) {
					this.description = "response == null";
					this.code = HttpStatusCode.BadRequest;
				}
				else {
					this.description = response.StatusDescription;
					this.code = response.StatusCode;
				}
			}

			public string description { get; set; }

			public HttpStatusCode code { get; set; }

			public bool unsuccess { get { return code != HttpStatusCode.OK; } }

			public override string ToString()
			{
				return ((int)code).ToString() + " - " + description;
			}
		}

		public string post(string url, Dictionary<string, string> data)
		{
			var request = WebRequest.Create(url);

			request.Method = "POST";
			request.ContentType = "application/x-www-form-urlencoded";

			StringBuilder data_str = new StringBuilder();

			foreach (var _d in data) {
				data_str.Append(_d.Key + "=" + HttpUtility.UrlEncode(_d.Value));
			}

			byte[] byteData = UTF8Encoding.UTF8.GetBytes(data_str.ToString());

			// Set the content length in the request headers  
			request.ContentLength = byteData.Length;

			// Write data  
			using (Stream postStream = request.GetRequestStream()) {
				postStream.Write(byteData, 0, byteData.Length);
			}

			try {
				using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) {
					response_last = new Response(response);
					// Get the response stream  
					StreamReader reader = new StreamReader(response.GetResponseStream());
					return reader.ReadToEnd();
				}
			}
			catch (WebException wex) {
				if (wex.Response == null) {
					response_last = new Response(null);
					return "";
				}
				using (HttpWebResponse errorResponse = (HttpWebResponse)wex.Response) {
					response_last = new Response(errorResponse);
					StreamReader reader = new StreamReader(errorResponse.GetResponseStream(), Encoding.UTF8);
					return reader.ReadToEnd();
				}
			}
		}
	}
}