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Issue description
Visual Studio 2015 with .NET 4.6.2
Build failed for project "1.1. Binary" under "framework\Samples\Tutorials\1. Classification".

In Progran.cs line 76

// Read the sparse inputs and outputs from the file
var (inputs, outputs) = reader.ReadSparseToEnd();

Error message:
Severity Code Description Project File Line Suppression State
Error CS0103 The name 'var' does not exist in the current context 1.1. Binary D:\WorkSpace\framework\Samples\Tutorials\1. Classification\1.1. Binary\Program.cs 76 Active
Error CS0103 The name 'inputs' does not exist in the current context 1.1. Binary D:\WorkSpace\framework\Samples\Tutorials\1. Classification\1.1. Binary\Program.cs 76 Active

The syntax at line 76 may supported from .NET4.7/C#7.

We should find out some way to avoid confusing new user which still working on VS2015.

Thanks,
Wiley Xu