From Ludek's comment above:
"As for craxddrt.dll. This dll was part of the Report Designer Component (RDC) SDK. That SDK was retired in CR XI R2 (11.5.x), which has been out of support for a few years now."
This is from the old RDC component which will NOT work in VS 2010. The newer versions of it support the Crystal Designer in VS only - they are not licensed for use in your code. So, you'll need to upgrade to the latest version of Crystal for VS, which you can find here: http://scn.sap.com/docs/DOC-7824.
1. UNINSTALL any older versions of the Crystal SDK - the new one does not "play well" when installed side-by-side with them and the old versions won't really work in the newer versions of VS.
2. Download and install the "Install Executable" from the above link. This will give you the integration into Visual Studio - the other downloads are for the various formats of runtime installs that you can use for deploying your application.
See the links Ludek mentions above for sample code and more information about the latest SDK.
-Dell