try
                {
                    File.Delete(complete_path);
                }
                catch (IOException)
                {
                    Response.Write("file non eliminato");
                }

         while(nocatch == 0 || i < 20) {
                try
                {
                    File.Delete(complete_path);
                    if (File.Exists(complete_path) == false) nocatch = 1;                   

                }
                catch (IOException)
                {
                    Response.Write("file non eliminato");
                    i++;
                }
         }