title: Entity Framework Core connection error to SQL Express
body: <p>I want to run an example project (Contoso University) in VS 2015 Community with SQL Express 2016 database but the login is failed with my user.
  I can connect from the VS Server Explorer and I copied the connection string into the <em>appsettings.json</em> but no msuch success.</p>
  
  <p>Connection string:  </p>
  
  <blockquote>
    <p>"DefaultConnection": "Data Source=MACHINENAME\SQLEXPRESS;Initial Catalog=ContosoUniversity1;Integrated Security=True"</p>
  </blockquote>
  
  <p>Error message:</p>
  
  <blockquote>
    <p>Cannot open database "ContosoUniversity1" requested by the login. The
    login failed. Login failed for user 'username'.</p>
  </blockquote>
  
  <p>Hm? :)</p>