added xml comments and restrict some access (#22796) #305

Job	Run time
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AllOf)	1m 12s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AnyOfNoCompare)	1m 18s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/UseDateTimeForDate)	1m 27s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AnyOf)	1m 25s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/OneOf)	1m 32s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/FormModels)	2s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/Petstore)	1m 48s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AllOf)	1m 47s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/FormModels)	1m 59s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/OneOf)	1m 20s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AnyOf)	2s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/UseDateTimeForDate)	1m 5s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/Petstore)	1m 21s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AnyOfNoCompare)	1m 8s
	17m 26s

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