C# Runtime Error: Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.
Add <startup> tag to the bottom of app.config file <?xml version=" 1.0 "?> <configuration> <startup useLegacyV2RuntimeActivationPolicy=" true "> <supportedRuntime version=" v4.0 " sku=" .NETFramework,Version=v4.0 "/> </startup> </configuration>