I want to limit a repeater's returned items by implementing a where clause.

Currently, I can put into the where box
DocumentName = 'Power Plant Technology Instructor'

and it will limit the returned item to one document named 'Power Plant Technology Instructor'


I would like to replace that static string with the name of the current document. I have been working with <%# GetDocumentUrl() %>, but I can't get the result:

/Information-For/Faculty---Staff/Employment-Information/Power-Plant-Technology-Instructor.aspx

to turn into a string to assign to DocumentName.

Has anyone done this before?