public static void ReleaseObject(object obj)
        {
            try
            {
                if (obj != null && Marshal.IsComObject(obj))
                {
                    Marshal.ReleaseComObject(obj);
                }

                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
                throw new LocalSystemException("Com Object not Released.", ex);
            }
            finally
            {
                GC.Collect();
            }
        }