binding fields in crystal report

i'm using visual studio .net 2003 and it's integrated crystal reports 9.
is there a way to manually bind the text field in report (using
report designer) that can use the field from the DataTable I put in that
report using ReportDocument.SetDataSource method?

It works when i generate a dataset .xsd file, but i have many tables
which are different at runtime (mainly because of inner joins) so i need
to set the data bindings manually, to use the DataTable which will exist
only at runtime