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what is the CrystalReportViewer.?
CrystalReportViewer is a report viewer to display the report like print preview.
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Why.?
End user wants reports in three modes.
0) View - you need CrystalReportViewer.
1) Export/File - you have to convert the report into needed format like Word, excel, pdf, etc.,
2) Print - you just send the report output to printer without seeing.
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How to Use.?
Check this
Beginners tutorial on how to load Crystal Reports using Crystal Report Viewer in Visual Studio 2012[
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