如何从数据源Reportviewer更改报告列的值

I have vb.net program that I'm looking to report Time Clock exceptions. I want to change the Value of a column inside vb.net If the Value is less than "0" then I want it to report "0" if it is > 0 then I want to report it's actual value. Is there a way to modify the reported value in that way inside report viewer or the report.rdlc?I have vb.net program that I'm looking to repor