Crystal Report Errors

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C#5.0

CrystalReports

hi my all friends.
i need help you.
i design windows app and design reports for this.but when i try run it throw multi errors due to unknown crystal namespace.please help me.

my errors:

Error 1 The type or namespace name 'Shared' does not exist in the namespace 'CrystalDecisions' (are you missing an assembly reference?) C:\Users\Z _ S\Documents\Visual Studio 2010\Projects\GR490\GR490\CrystalReport1.cs 14 28 GR490

Error 2 The type or namespace name 'ReportSource' does not exist in the namespace 'CrystalDecisions' (are you missing an assembly reference?) C:\Users\Z _ S\Documents\Visual Studio 2010\Projects\GR490\GR490\CrystalReport1.cs 15 28 GR490

Error 3 The type or namespace name 'Engine' does not exist in the namespace 'CrystalDecisions.CrystalReports' (are you missing an assembly reference?) C:\Users\Z _ S\Documents\Visual Studio 2010\Projects\GR490\GR490\CrystalReport1.cs 16 43 GR490

Error 4 The type or namespace name 'ReportClass' could not be found (are you missing a using directive or an assembly reference?) C:\Users\Z _ S\Documents\Visual Studio 2010\Projects\GR490\GR490\CrystalReport1.cs 19 35 GR490