how to add a function when it disposes code example

Example: c# dispose pattern

#region IDisposable Support
        private bool _disposedValue = false; // To detect redundant calls

        /// <summary>
        /// Releases unmanaged and - optionally - managed resources.
        /// </summary>
        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
        protected virtual void Dispose(bool disposing)
        {
            if (!_disposedValue)
            {
                if (disposing)
                {
                  	/// dispose and set objects to null
                  	/// Example -
                    /// _uow?.Dispose();
                    /// _ouw = null;
                }

                _disposedValue = true;
            }
        }

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
            Dispose(true);
            // GC.SuppressFinalize(this);
        }
        #endregion