How to replace Fileupload to Image.imageurl

Question

how to replace Image1.ImageUrl to Fileupload1 in below code. 

string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
           string contenttype = FileUpload1.PostedFile.ContentType;

           using (Stream fs = FileUpload1.PostedFile.InputStream)
           {
               using (BinaryReader br = new BinaryReader(fs))
               {
                   byte[] bytes = br.ReadBytes((Int32)fs.Length);
       }
   }
 }