How do I associate an account to a contact using C#/SDK in Microsof Dynamics/CRM?

Hello.

I have sort of associated an account to a contact using C#/SDK. I used the parentcustomerid attribute on the contact entity. If I go the CRM website (see this screenshot: hYYp://imgur.com/bigMptS. Please replace HYYp with http.) and look up all the active contacts under my name, it is showing the acct under organization. But when I click on the acct and want to view the details  (see this screenshot: hYYp://imgur.com/28QYMfr. Please reply hYYP with http.), I cannot see any reference to the organization listed in the list.

I also manually created a new contact using the Dynamics website (i.e. not SDK) and I can't find a way on entering a relationship.

Any ideas on how to do it via C# and via the website?

Thanks very much