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Microsoft TS: Accessing Data with Microsoft .NET Framework 4 Sample Questions:

1. You use Microsoft Visual Studio 2010 and the Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. The application uses DataContexts to query
the database.
You define a foreign key between the Customers and Orders tables in the database.
You need to ensure that when you delete a customer record, the corresponding order records are deleted.
You want to achieve this goal by using the minimum amount of development effort. What should you do?

A) Override the Delete operation of the customer entity.
B) Use the ExecuteDynamicDelete method of the DataContext object.
C) Modify the foreign key between the Customers and Orders tables to enable the ON DELETE CASCADE option.
D) Remove the foreign key between the Customers and Orders tables.

2. You need to write a LINQ query that can be used against a ContosoEntities context object named context to
find all
parts that have a duplicate name. Which of the following queries should you use?
(Each correct answer presents a complete solution. Choose two).

A) context.Parts.Any(p => context.Parts.Any(q => p.Name == q.Name));
B) context.Parts.Where(p => context.Parts.Any(q => q.Name == p.Name && p.Id != q.Id);
C) context.Parts.GroupBy(p => p.Name).Where(g => g.Count() > 1).SelectMany(x => x);
D) context.Parts.SelectMany(p => context.Parts.Select(q => p.Name == q.Name && p.Id != q.Id));

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server 2008 database. The database includes a table named
dbo.Documents
that contains a column with large binary data. You are creating the Data Access Layer (DAL).
You add the following code segment to query the dbo.Documents table. (Line numbers are included for
reference only.)
01 public void LoadDocuments(DbConnection cnx)
02 {
03 var cmd = cnx.CreateCommand();
04 cmd.CommandText = "SELECT * FROM dbo.Documents";
05 ...
06 cnx.Open();
07 ...
08 ReadDocument(reader);
09 }
You need to ensure that data can be read as a stream. Which code segment should you insert at line 07?

A) var reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly);
B) var reader = cmd.ExecuteReader(CommandBehavior.KeyInfo);
C) var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess);
D) var reader = cmd.ExecuteReader(CommandBehavior.Default);

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application. You use the ADO.NET Entity Framework to model entities. You write the following code segment. (Line numbers are included for reference only.)
01 AdventureWorksEntities context = new AdventureWorksEntities("http://
localhost:1234/AdventureWorks.svc");
02 ...
03 var q = from c in context.Customers
04 where c.City == "London"
05 orderby c.CompanyName
06 select c;
You need to ensure that the application meets the following requirements:
-Compares the current values of unmodified properties with values returned from the data source.
-Marks the property as modified when the properties are not the same. Which code segment should you insert at line 02?

A) context.MergeOption = MergeOption.NoTracking;
B) context.MergeOption = MergeOption.OverwriteChanges;
C) context.MergeOption = MergeOption.PreserveChanges;
D) context.MergeOption = MergeOption.AppendOnly;

5. You use Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server
2008 database.
You need to ensure that the application connects to the database server by using SQL Server
authentication.
Which connection string should you use?

A) SERVER=MyServer; DATABASE=AdventureWorks; Integrated Security=SSPI; UID=sa; PWD=secret;
B) SERVER=MyServer; DATABASE=AdventureWorks; Trusted Connection=true;
C) SERVER=MyServer; DATABASE=AdventureWorks; UID=sa; PWD=secret;
D) SERVER=MyServer; DATABASE=AdventureWorks; Integrated Security=false;

Solutions: