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

I had just updated my Entity framework to version 6 in my Visual studio 2013 through NugetPackage and add following References:

System.Data.Entity,
System.Data.Entity.Design,
System.Data.Linq

by right clicking on references->Add references in my project. Now delete my previously created Entity model and recreate it again,Built solution. Now It works fine for me.