Forms Data Controls :: Using AppSettings Within A TemplateField On The Aspx Side?

I know we can use appsettings on the aspx side with "<%$appSettings:testkey %>"

however is there a way to use appsetting in the following code example?

'<%# Eval("member_value", "http://www.test.com/members/memberpage.aspx?member={0}") %>'

What I want to do is store the URL in an appsetting, but Im not sure this is possible because of the databinding.

Also a second question, is it possible to concatenate appsettings on the aspx side such as the following code (which does not work)?

"<%$appSettings:testkey + $appSettings:testkey2 %>"