Reading and uploading a file with REST (c#)

readAndUpload.cs

//read file
Console.Write("Enter file path: ");
var filePath = Console.ReadLine();
filePath = String.IsNullOrEmpty(filePath) ? "C:\\Users\\Sander\\Desktop\\test.docx" : filePath;
var byteArray = File.ReadAllBytes(filePath);

//prep REST endpoint
var addFileInFolder =
String.Format("_api/web/lists/getByTitle(@TargetLibrary)/RootFolder/folders(@TargetFolderName)/files/add(url=@TargetFileName,overwrite='{3}')?" +
"@TargetLibrary='{0}'&@TargetFolderName='{1}'&@TargetFileName='{2}'",docLibName, folderName, fileName, true);

//prepare webrequest.
try
{
//SharePoint site collection url
var spSite = new Uri(siteUrl);

//authenticate with SPO user.
var success = SpoAuthUtility.Create(spSite, userName, WebUtility.HtmlEncode(password), false);
Console.WriteLine("---Authentication passed: {0} ---", success);

if (success)
{
    //get X-RequestDigest, required for POST.
    var formDigest = SpoAuthUtility.GetRequestDigest();

    //1. Upload file.
    //prep rest call
    var url = new Uri(String.Format("{0}/{1}", SpoAuthUtility.Current.SiteUrl, addFileInFolder));
    Console.WriteLine("REST Call addFile: {0}\n\n", url);

    //prep headers for addFile POST request
    var headers = new Dictionary<String, String> { { "binaryStringRequestBody", "true" }, { "X-RequestDigest", formDigest } };

    // Send a json odata request to SPO rest services to upload a file to a document library.
    // pass in the helper object that allows us to make authenticated calls to SPO rest services
    var result = HttpHelper.SendODataJsonRequest(
        url,
        "POST", //writing data to SharePoint. 
        byteArray,
        (HttpWebRequest) WebRequest.Create(url),
        SpoAuthUtility.Current,
        headers
        );

    var response = Encoding.UTF8.GetString(result, 0, result.Length);
    Console.WriteLine(response);
    Console.WriteLine("\n---File added---");
}
catch{}