using System;
using System.Text;
using System.Net;

namespace ConsoleApplication1
{
    class Program
    {
        static void SetBasicAuthHeader(WebRequest request, String userName, String userPassword)
        {
            string authInfo = userName + ":" + userPassword;
            authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
            request.Headers["Authorization"] = "Basic " + authInfo;
        }
        
        static void Main(string[] args)
        {
            string postData = "{\"jsonrpc\": \"1.0\", \"id\":\"1\", \"method\": \"importprivkey\", \"params\": [\"5xxxxPRIVATEKEYHERExxxxxxxxxx\", \"NewKeyName\", false] }";
            //string postData = "{\"jsonrpc\":\"1.0\",\"id\":\"1\",\"method\":\"getbalance\"}";

            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create("http://10.0.0.30:8332");

            SetBasicAuthHeader(request, "rpc_username", "rpc_password");
            
            request.Method = "POST";
            request.ContentType = "application/json-rpc";    
            request.ContentLength = postData.Length;

            System.IO.Stream writeStream = request.GetRequestStream();
            UTF8Encoding encoding = new UTF8Encoding();
            byte[] bytes = encoding.GetBytes(postData);
            writeStream.Write(bytes, 0, bytes.Length);
            writeStream.Close();
        }
    }
}

        private void button1_Click(object sender, EventArgs e)
        {
           
        NameValueCollection query = new NameValueCollection();

        string apikey = "*****";
        string secret = "*****";

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://btc-e.com/tapi");
        req.Method = "POST";

        query.Add("nonce", "100"); // INCREASE BY 1 ON NEXT CALL
        query.Add("method", "getInfo");
       
        String post_data = "";
        for (int i = 0; i < query.Count; i++)
        {
            post_data += "&";
            post_data += query.Keys[i];
            post_data += "=";
            post_data += query[i];
        }
        post_data = post_data.Substring(1);
        richTextBox1.AppendText(post_data); // CHECKIN POST DATA
     
        HMACSHA512 hmac = new HMACSHA512(Convert.FromBase64String(secret));
        String sign = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(post_data)), Base64FormattingOptions.None);

        req.Headers.Add("Key", apikey);
        req.Headers.Add("Sign", sign);

        req.UserAgent = "PoorGirl";
        req.ContentType = "application/x-www-form-urlencoded";

        StreamWriter reqStream = new StreamWriter(req.GetRequestStream());
        reqStream.Write(post_data);
        reqStream.Close();

        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

        StreamReader respStream = new StreamReader(resp.GetResponseStream());
        richTextBox1.AppendText(respStream.ReadToEnd()); // SHOW RESPONSE
        respStream.Close();
            
        }