Filter report from vb.net

[swetham]

Hi,
I have a crosstab which shows the data from satrtdate to enddate (Week start and end). I have been passing the startdate and enddate from vb.net.I am using crystalreportviewer in vb.net(vs 2008). Now I want to give option to user to select report according to
1) This week
2) Next week
3) This month
4) Next Month.

My question is
1) Is it possible to give user option to select all the four options in crystal report viewer?
2) Or i should place combobobox consisting all the four options in one form and do according to it?
I want to use Only one report for all the four options.

What are the formulas for all the four options?

Thanks,
sweish