请问我有两个线程或者说多个线程去访问一个静态方法，线程如下：

 Thread threadOne = new Thread(new ThreadStart(StartThreadOne));
  Thread threadTwo = new Thread(new ThreadStart(StartThreadTwo));
  threadOne.Start();
  threadTwo.Start();

 private static void StartThreadTwo()  

{            

     Bitmap mapOne = GetBitmapByPicUrl("Url_One");        

}

  private static void StartThreadOne()

 {            

    Bitmap mapTwo = GetBitmapByPicUrl("Url_Two");

}

　　然后静态方法如下：

/// <summary>
        /// 获取网页图片
        /// </summary>
        /// <param name="m_PicUrl"></param>
        /// <returns></returns>
        public static Bitmap GetBitmapByPicUrl(string m_PicUrl)
        {
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(m_PicUrl);
            req.Method = "GET";
            req.Referer = m_PicUrl;
            req.Connection = "true";
            req.ContentLength = 0;
            using (WebResponse web = req.GetResponse())
            {
                var resStream = web.GetResponseStream();
                Bitmap sourcebm = new Bitmap(resStream);//初始化Bitmap图片
                return sourcebm;
            }
        }

     请问这个多线程去访问会不会有问题，会不会出现死锁的情况，请大神详细解释一下，包括内存之间的关系。