For a project and example on how to and use CR Parameters see the Document ( soon to be converted into a Blog )
PS - Removed link to archived SCN post, can no longer update the application and attach it.
PSS - Also remove WIKI link since they too are going away
Crystal Reports for Visual Studio
See Document for more info and sample application is the latest version
March 12, 2020 - Fixed the PaperOrientation by section code in drop down list.
Crystal Reports, Parameters, how to, .net , KBA , BI-DEV-NET , BI Software Development Kits (SDKs) - .NET or Other , How To