How to upload a file in a BOX Storage Folder using Box Api ?

[milindg90]

public static void UploadFileRequest(string FolderID, string accesstoken)
        {
 
            string boundary = string.Format("----------------------------{0}", DateTime.Now.Ticks.ToString("x"));
            string filenamee = "C:\\Users\\Administrator\\Desktop\\Text.txt";
            HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create("https://upload.box.com/api/2.0/files/content");
            ASCIIEncoding encoding = new ASCIIEncoding();
            //string postData = "{\"parent\": {\"id\": \"" + ParentFolderId + "\"}}";
            string kk = string.Format("filename=@{0}&parent_id={1}", filenamee, FolderID);
            byte[] data = encoding.GetBytes(kk);
 
            httpWReq.Method = "POST";
            httpWReq.Headers.Add("Authorization", "Bearer HVJfdT8ugzWoV3bQSk5XMUhQdoiuioCc");
            httpWReq.ContentType = "application/json";
            httpWReq.ContentLength = data.Length;
 
            using (Stream stream = httpWReq.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }
 
            HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse();//I am getting error in response there might be a possibility that body of my content is not correct
 
            string responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
        }

PleaseHelp ,, Thankyou