c# - what am I missing here? DataGrid and ListView not getting populated in WPF application -

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I am following a book on C # object-oriented programming and this application is not working. Datagrids and Listview are not populating. What important thing am I missing?

I can think that the only thing is that I am not connecting to the database because I do not know the syntax for the connection string, what is put in the data source = and so on. data source. \ Sqlexpress is in the book but my SQL Server 2012 is There is no error, so I do not know what to do.
Here is the code as the book: Back @ "Integrated Security = True; Data Source =. \ SQLEXPRESS;" + "Initial Catalog = OfficeSppy" ";

As I have written, here is the code: 

  back @" data source = servername ; Initial Catalog = OfficeSupply "+ @" User ID = Username; Password = password ";   
 
 I am completely noob, so I'm not completely sure that this is the problem.   
 < Take a look at the book when you go through the  SQL data source  or  object data source  div class = "post-text" itemproc = "text"> 
 Which is your return DB connection string which you really want to do in your app. Config XML file

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