Provides a code section where a specified piece of code is executed on leave (and enter optionally)

ScopeGuard.cs

public sealed class ScopeGuard : IDisposable
{
    #region Construction and initialization of this instance

    public static ScopeGuard WithOnLeave(Action onLeave)
    {
        return new ScopeGuard(onLeave);
    }

    private ScopeGuard(Action onLeave)
    {
        this.onLeave = onLeave ?? delegate { };
    }

    private Action onLeave;

    #endregion Construction and initialization of this instance

    #region Change leave action

    public void OnLeave(Action onLeave)
    {
        this.onLeave = onLeave ?? delegate { };
    }

    #endregion Change leave action

    #region IDisposable Member

    public void Dispose()
    {
        var tmp = this.onLeave;
        this.onLeave = null; // set to null first, tmp() could throw
        tmp?.Invoke();
    }

    #endregion IDisposable Member
}