The type or namespace name 'Entity' does not exist in the namespace 'System.Data'

Question

I\'m using WS class and it gave me error when I run the application:

The type or namespace name \'Entity\' does not exist in the namespace \'System.Data\' 
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Answer 1

Make sure you have the EntityFramework Nuget package installed for your project.

From @TonyDing's answer:

Right-click on the Solution from the Visual Studio Solution Explorer click the Manage Nuget packages for solution and install the EntityFramework

Once it is installed, I still had the error, but then did a reinstall per @papergodzilla's comment:

Update-Package -reinstall

and it resolved my issue

Do this in the Package Manager Console (View > Other windows > Package Manager Console).
Now everything is good!