What's the difference between dnxcore50 on Windows and Linux?

Question

It looks like System.Data.SqlClient is defined in dnxcore50 when running on Windows, but not on Linux.

Aren't they both corefx?

For example, an app that targets dnxcore50 beta7, or beta8, and references System.Data.SqlClient will build and run fine in Windows, but on Linux will compile fine only to at execution throw this runtime error;

An unhandled exception has occurred: Could not load file or assembly 
'System.Data.SqlClient, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. 
The system cannot find the file specified.

Answer 1

With ASP.NET 5 RC1, SqlClient is now cross platform and so you can query Microsoft SQL Server from Linux and Mac too.

More info in the release notes below (look for Cross-platform SQL Client)

http://blogs.msdn.com/b/webdev/archive/2015/11/18/announcing-asp-net-5-release-candidate-1.aspx