There have been several posts asking about how to create and show a broken rule for a custom field property on a business object.  This sample uses the StrataFrameSample database and adds a custom field property and rules that must be applied to that custom field property.  It also shows how to properly add a BrokenRule for a custom property so that all of the error provider logic will appear.

Updated version that includes 3 projects:

• Winforms Project
• Business Class Library
• Web Application

There was some confusion as to how to make this work on a web form, which really there isn't any additional logic within the BO that is required...so I added a Web Application so that you could see how it gets plumbed in.  Hope this helps.