I’m sure every seasoned .NET developer has been in the situation at one stage or another, probably in testing code, where they need to access a non-public setter of a property (or maybe a private member), and it can’t be mocked.  We all know the (somewhat scary) reflection trick to get at the said setter method and invoke it.   I just hit this problem today trying to mock some response messages from a Microsoft Dynamics XRM 2011 OrganizationService.  Thankfully F# gives us cool things like Quotations and s[...]