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ASP.NET MVC: Database Connection Issue

I am using this guide: http://www.asp.net/mvc/tutorials/mvc-music-store-part-7

As indicated, I entered ASP.NET Web Application Administrator, but when I enter the security tab:

There is a problem with the data store you selected. This could be caused by an invalid server name or credentials, or by insufficient permission. It can also be called by the role manager function is not enabled. Click below to redirect to where you can select new store data.

The following message may help diagnose the problem: Unable to connect to SQL Server database .

I clicked the button below, but that did not help.

So far I have been doing exactly (I think ...) how the guide said I should. I have a terrible feeling that the answer is obvious.

Edit 1: BTW, When I open the complete solution from the manual and try to open ASP.NET Web Application Administrator, the following error appears:

There is a problem with the data store you selected. This could be caused by an invalid server name or credentials, or by insufficient permission. It can also be called by the role manager function is not enabled. Click below to redirect to where you can select new store data.

: A SQL Server. . , SQL Server . (: SQL , : 26 - /)

2: :

<connectionStrings>
    <add name="MusicStoreEntities"
     connectionString="Data Source=|DataDirectory|MvcMusicStore.sdf"
     providerName="System.Data.SqlServerCe.4.0"/>
  </connectionStrings>
+3
1

SQL- express app_data?

+1

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