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

1. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses the EntityFramework.
The application has an entity named Person. A Person instance named person1 and an ObjectContext
instance named model exist.
You need to delete the person1 instance. Which code segment should you use?

A) model.ExecuteStoreCommand("Delete", new []{new ObjectParameter("Person", person1)}; model.SaveChanges();
B) model.ExecuteStoreCommand("Detach", new []{new ObjectParameter("Person", person1)}; model.SaveChanges();
C) model.Detach(person1); model.SaveChanges();
D) model.DeleteObject(person1); model.SaveChanges();

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.SelectMany(p => context.Parts.Select(q => p.Name == q.Name && p.Id != q.Id));
B) context.Parts.Any(p => context.Parts.Any(q => p.Name == q.Name));
C) context.Parts.GroupBy(p => p.Name).Where(g => g.Count() > 1).SelectMany(x => x);
D) context.Parts.Where(p => context.Parts.Any(q => q.Name == p.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 application contains two
SqlCommand objects named cmd1 and cmd2.
You need to measure the time required to execute each command. Which code segment should you use?

A) Stopwatch w1 = Stopwatch.StartNew(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1 = Stopwatch.StartNew(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);
B) Stopwatch w1 = Stopwatch.StartNew(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1.Start(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);
C) Stopwatch w1 = new Stopwatch(); w1.Start(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1.Reset(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);
D) Stopwatch w1 = new Stopwatch(); w1.Start(); cmd1.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds); w1.Start(); cmd2.ExecuteNonQuery(); w1.Stop(); Trace.WriteLine(w1.ElapsedMilliseconds);

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. You use Entity SQL to retrieve data from the
database.
You need to enable query plan caching. Which object should you use?

A) EntityDataReader
B) EntityTransaction
C) EntityConnection
D) EntityCommand

5. You use Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server
2008 database.
You add the following stored procedure to the database.
CREATE PROCEDURE dbo.GetClassAndStudents AS BEGIN
SELECT * FROM dbo.Class
SELECT * FROM dbo.Student
END
You create a SqIConnection named conn that connects to the database.
You need to fill a DataSet from the result that is returned by the stored procedure.
The first result set must be added to a DataTable named Class, and the second result set must be added to
a DataTable named Student.
Which code segment should you use?

A) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ds.Tables.Add("Class"); ds.Tables.Add("Student"); ad.Fill(ds);
B) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ad.Fill(ds);
C) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ad.MissingMappingAction = MissingMappingAction.Ignore; ad.Fill(ds, "Class"); ad.Fill(ds, "Student");
D) DataSet ds = new DataSet(); SqlDataAdapter ad = new SqlDataAdapter("GetClassAndStudents", conn); ad.TableMappings.Add("Table", "Class"); ad.TableMappings.Add("Table1", "Student") ; ad.Fill(ds) ;

Solutions: