# Introduction > Recommendation file folder https://github.com/aws/porting-assistant-dotnet-datastore/tree/master/recommendation > Manifest file https://github.com/aws/porting-assistant-dotnet-datastore/blob/master/data/namespaces.recommendation.lookup.json ## contribute to recommendation 1. add or modify recommendation in the same file data structure in RecommedationPOJO.cs 2. for new recommendation file, add namespace -> file name in the lookup file https://github.com/aws/porting-assistant-dotnet-datastore/blob/master/data/namespaces.recommendation.lookup.json ## Requirements * dotnet ## Technology * C# ## run build the exe or run from sln ```shell RecommendationValidator.exe -f file-to-recommendation-path ``` for example ```shell RecommendationValidator.exe -f system.io.recommendation.json ```