Re: [url] Update csharp test to identify .net fwk version (#46)

When I try compiling with this, I get

```
testuri.cs(67,60): error CS0246: The type or namespace name
        'TargetFrameworkAttribute' could not be found (are you missing a using
        directive or an assembly reference?)
testuri.cs(67,92): error CS0246: The type or namespace name
        'TargetFrameworkAttribute' could not be found (are you missing a using
        directive or an assembly reference?)
```

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