Is there any way to JOIN all values of a field in to a Single row text box

Hi

I have a requirement to show all values in a data field to show in one single text box.

for eg: I have a date field 'EntreeDate' and it has around 30 values in it. '1-Jan-2009' to '30-Jan-2009' total 30 rows.

I want to join all of them and show them in a single row text box in my report...

Any ideas how to achieve this..

thanks in advance..