can I put asp.net code in dynamically created controls?

Hi,
I need to create web controls (e.g. label etc) dynamically. This is not the problem.
The problem is that for example,
on my onload event, I create a label.  The text of the label is read from one line of a xml file.
But sometimes the text should be like " Messages (4)",  in which the message count is something not generic and need some logic to calculate. I tried to put things like  "Message (<#% MessageCount %>) " in my xml file, but the displayed text label is:
Message (<#% MessageCount %>) instead of Message (4 ). Is there a way I can achieve what I want?
Many Thanks
Jerry

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