Save image to web service and get its back

I am building an online book store , the upload of the pictures of the books shall be through XML web service
Now I found the code to save the image at the web service file system but The Problem is
1 - how to Build a method to get back the url of the image or the image it self
2 - how to Get the image or the image url and set to asp.net image control or other suitable control

below is the method at the web service accept parameters : 1- the image in byte array form and the 2 - file name , this method save the picture in folder called "TransientStorage" folder

[WebMethod]
       public string UploadFile(byte[] f, string fileName)
       {
           // the byte array argument contains the content of the file
           // the string argument contains the name and extension
           // of the file passed in the byte array
           try
           {
               // instance a memory stream and pass the
               // byte array to its constructor
               MemoryStream ms = new MemoryStream(f);

               // instance a filestream pointing to the
               // storage folder, use the original file name
               // to name the resulting file
               FileStream fs = new FileStream(System.Web.Hosting.HostingEnvironment.MapPath
                           ("~/TransientStorage/") + fileName, FileMode.Create);

               // write the memory stream containing the original
               // file as a byte array to the filestream
               ms.WriteTo(fs);

               // clean up
               ms.Close();
               fs.Close();
               fs.Dispose();

               // return OK if we made it this far
               return "OK";
           }
           catch (Exception ex)
           {
               // return the error message if the operation fails
               return ex.Message.ToString();
           }

Tags: C# 3.5, ASP.NET