Foreign Key Contraints, deletion of parent

I want to prevent the deletion of the parent, and my primary/foreign key constraints do this for me.  Unfortunately, I have no way of knowing if the parent is deleteable or not, so if a user clicks on the "Delete" button, for example, they would get a nasty error message. 

I would love it if there was some sort of parameter in my entities that would tell me if the entity is deleteable or not, based on a foreign key constraint or some other set of rules that I could define.   Perhaps an IsDeleteable property?

Would this be too much, or overkill to add?  How have you approached this?

Thanks.

I'm doing a little research on how to find the dependencies of my tables and whether or not a row is deleteable, and I found this handy blog entry:
http://blog.sqlauthority.com/2006/11/01/sql-server-query-to-display-foreign-key-relationships-and-name-of-the-constraint-for-each-table-in-database/

More info on how to find if a record is indeed deleteable:

http://1bit.us/ViewArticle.aspx?id=9d947d58-ed71-49d9-b712-6bf051e8e3ff

Basically, you create a table called "Relationships" which would store some basic info about the tables and their dependencies.

Then, you create a stored proc called "CanDeleteQueries" that will look up the table and primary key of the entity in question, and it returns a count of how many dependencies it has.

If the count > 0, you know you cannot delete it.

Our IsDeleteable property would look something like this:

public bool IsDeleteable()
{
   get { return Common.CanDelete(this.TableName, this.EntityId); }

}

What do you think?