Change Filter run time

[Ricky]

Is there a way I can change the filter in run time based on a report parameter?

Ex. The user can choose, via A, or via B
If A is selected, the filter should filter the data via column A in the database,
If B is selected, the filter should filter the data via column B in the database.

Thank you. 

[Hadib Ahmabi]

Try with the Fields() function. 
http://www.telerik.com/help/reporting/expressions-report-functions.html
It allows you to dynamically select fields. You can check this thread
http://www.telerik.com/community/forums/reporting/telerik-reporting/how-to-allow-dynamic-grouping-selections-paramters-in-a-report.aspx
it discusses grouping but it is similar.