Only person who creates an ad can edit it.

[ddelpercio]

https://msdn.microsoft.com/en-us/library/system.web.mvc.authorizeattribute%28v=vs.98%29.aspx?f=255&MSPPError=-2147217396

Don't show edit in the details, but make a Profile "My Ads" access to Edit.

[ddelpercio]

http://stackoverflow.com/questions/12458683/asp-net-mvc-how-to-manage-user-content-using-asp-net-membership-provider

[ddelpercio]

http://stackoverflow.com/questions/21328580/how-to-allow-users-to-only-edit-their-details-in-a-catalog

[ddelpercio]

http://stackoverflow.com/questions/1417248/asp-net-mvc-verify-that-editing-record-is-allowed-ownership

[ddelpercio]

Test this in a dummy MVC app first? Or branch.