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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 create an application.
The application uses the ADO.NET Entity Framework to manage customer and related order records.
You add a new order for an existing customer. You need to associate the Order entity with the Customer
entity.
What should you do?

A) Set the Value property of the EntityReference of the Order entity.
B) Call the Add method on the EntityCollection of the Order entity.
C) Use the AddObject method of the ObjectContext to add both Order and Customer entities.
D) Use the Attach method of the ObjectContext to add both Order and Customer entities.

2. Which one of these samples it the correct way to close the connection using Command Behavior?

A) SqlDataReader rdr = new SqlDataReader(); string sql = @"sql statement"; SqlConnection conn = connection.GetConnection(); SqlCommand cmd = new SqlCommand(sql, conn); SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); rdr.Close(); Console.WriteLine("{0}", rdr);
B) SqlDataReader rdr = new SqlDataReader(); string sql = @"sql statement"; SqlConnection conn = connection.GetConnection(); SqlCommand cmd = new SqlCommand(sql, conn); SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); conn.Close(); Console.WriteLine("{0}", rdr);
C) using (SqlDataReader rdr = new SqlDataReader())
{
string sql = @"sql statement";
SqlConnection conn = connection.GetConnection();
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
Console.WriteLine("{0}", rdr);
}
D) SqlDataReader rdr = new SqlDataReader(); string sql = @"sql statement"; SqlConnection conn = connection.GetConnection(); SqlCommand cmd = new SqlCommand(sql, conn); SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); Console.WriteLine("{0}", rdr);

3. You use Microsoft .NET Framework 4.0 to develop an application that uses LINQ to SQL. The LINQ to SQL
model contains the Product entity.
A stored procedure named GetActiveProducts performs a query that returns the set of active products from
the database.
You need to invoke the stored procedure to return the active products, and you must ensure that the LINQ
to SQL context can track changes to these entities. What should you do?

A) Add a property named GetActiveProducts to the Product entity.
B) Navigate to the GetActiveProducts stored procedure in Server Explorer, and drag the procedure onto the Product entity in the LINQ to SQL model designer surface.
C) Select the Product entity, view the entity's property window, and change the Name for the entity to GetActiveProducts.
D) Select the Product entity, view the entity's property window, and change the Source for the entity to GetActiveProducts.

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 create the classes shown in the following exhibit:

You add the following code segment to the application. (Line numbers are included for reference only.)
01 public void QueryPlayers (List <League> leagues) {
02 ...
03 }
You create a LINQ query to retrieve a collection of Player objects.
You need to ensure that the collection includes all the players from each team and every league. Which
code segment should you insert at line 02?

A) var query = leagues.SelectMany(l => l.Teams.SelectMany(t => t.Players));
B) var query = leagues.Select(l => l.Teams.SelectMany(t => t.Players));
C) var query = leagues.Select(l => l.Teams.Select(t => t.Players));
D) var query = leagues.SelectMany(l => l.Teams.Select(t => t.Players));

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application.
You use the ADO.NET Entity Framework Designer to model entities.
You need to retrieve an entity, and you must ensure that the entity is loaded in a detached state.
Which MergeOption enumeration value should you use to retrieve the entity?

A) PreserveChanges
B) OverwriteChanges
C) NoTracking
D) AppendOnly

Solutions: