How winform to quickly upload and download files?

public static bool UploadFile(string localFilePath, string serverFolder)
       {
           bool b = false;
           System.Net.WebClient myWebClient = new System.Net.WebClient();
           myWebClient.Credentials = System.Net.CredentialCache.DefaultCredentials;
           FileStream fs = new FileStream(localFilePath, FileMode.Open, FileAccess.Read);
           BinaryReader br = new BinaryReader(fs);

          byte[] postArray = br.ReadBytes((int)fs.Length);
          Stream postStream = myWebClient.OpenWrite(serverFolder, "PUT");
          if (postStream.CanWrite)
               {
                   postStream.Write(postArray, 0, postArray.Length);
                   b = true;
               }
               postStream.Close();
               postStream.Dispose();



           return b;
       }

          public static string Download(string uri, string savePath)
       {
           if (!Directory.Exists(savePath)) Directory.CreateDirectory(savePath);

           string fileName = string.Empty;

           if (uri.IndexOf(@"..\") > -1 || uri.IndexOf(@"\") > -1)
           {
               uri = uri.Replace(@"..\", "/");
               uri = uri.Replace(@"\", "/");
           }
           if (uri.IndexOf("\\") > -1)
           {
               fileName = uri.Substring(uri.LastIndexOf("\\") + 1);
           }
           else
           {
               fileName = uri.Substring(uri.LastIndexOf("/") + 1);
           }
           if (!savePath.EndsWith("/") && !savePath.EndsWith("\\"))
           {
               savePath = savePath + "/";
           }


           WebClient client = new WebClient();

               client.DownloadFile(uri, savePath);



           return savePath;
       }