It looks like System.Data.SqlClient is defined in dnxcore50 when running on Windows, but not on Linux.
Are they not corefx ?
For example, an application that is designed for dnxcore50 beta7 or beta8, and System.Data.SqlClient links will work fine and work on Windows, but on Linux it will only compile when this runtime error is executed when this error is executed;
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.
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