this is very Basic question,
U have to create Dataset,Report Document, and CrystalReportViewer and then you have to put data in your dataset then assign that data to Dataset, then select the "reportSource" of your CrystalReportViewer as your "Report Document"
This question raised many times , and answerd many times in COde Project, Pls Refer..-
Creating Crystal Reports using C# with Datasets
Download the files and try..
All the Best..