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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 LINQ to SQL.
The application contains the following model. You write the following code. (Line numbers are included for
reference only.)
01 static void Insert()
02 {
03 NorthwindDataContext dc = new NorthwindDataContext();
04 Customer newCustomer = new Customer();
05 newCustomer.Firstname = "Todd";
06 newCustomer.Lastname = "Meadows";
07 newCustomer.Email = "[email protected]";
08 .....
09 dc.SubmitChanges();
10 }

A product named Bike Tire exists in the Products table. The new customer orders the Bike Tire product.
You need to ensure that the correct product is added to the order and that the order is associated with the
new customer.
Which code segment should you insert at line 08?

A) Product newProduct = new Product(); newProduct.ProductName = "Bike Tire"; Order newOrder = new Order(); newOrder.Product = newProduct;
B) Product newProduct = new Product(); newProduct.ProductName = "Bike Tire"; Order newOrder = new Order (); newOrder.Product = newProduct; newCustomer.Orders.Add(newOrder) ;
C) Order newOrder = new Order();
newOrder.Product = (from p in dc.Products
where p.ProductName == "Bike Tire"
select p).First();
newCustomer.Orders.Add(newOrder) ;
D) Order newOrder = new Order();
newOrder.Product = (from p in dc.Products
where p.ProductName == "Bike Tire"
select p) .First();

2. You use Microsoft .NET Framework 4.0 to develop an ASP.NET application. The application uses
Integrated Windows authentication.
The application accesses data in a Microsoft SQL Server 2008 database that is located on the same server
as the application.
You use the following connection string to connect to the database.
Integrated Security=SSPI; Initial Catalog=AdventureWorks;
The application must also execute a stored procedure on the same server on a database named pubs.
Users connect to the ASP.NET application through the intranet by using Windows-based authentication.
You need to ensure that the application will use connection pooling whenever possible and will keep the
number of pools to a minimum.
Which code segment should you use?

A) command.CommandText = "USE [pubs]; exec uspLoginAudit;"; using (SqlConnection connection = new SqlConnection( "Initial Catalog=AdventureWorks; Integrated Security=SSPI; MultipleActiveResultSets=True")) {
connection.Open();
command.ExecuteNonQuery();
}
B) command.CommandText = "exec uspLoginAudit;";
using (SqlConnection connection = new SqlConnection( "Integrated Security=SSPI;")) {
connection.Open();
command.ExecuteNonQuery();
}
C) command.CommandText = "exec uspLoginAudit;"; using (SqlConnection connection = new SqlConnection( "Integrated Security=SSPI; Initial Catalog=pubs")) {
connection.Open();
command.ExecuteNonQuery();
}
D) command.CommandText = "USE [pubs]; exec uspLoginAudit;"; using (SqlConnection connection = new SqlConnection( "Integrated Security=SSPI; Initial Catalog=AdventureWorks")) {
connection.Open();
command.ExecuteNonQuery();
}

3. 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 model entities.
The application includes a Customer entity along with a CustomerKey property of the Guid type as shown in
the following exhibit:

You discover that when the application adds a new instance of a Customer, calling the SaveChanges
method
results in the following error message: "Server generated keys are only supported for identity columns."
You need to ensure that the application can add new Customer entities. What should you do?

A) Call the ObjectContext.CreateEntityKey method before saving a Customer entity.
B) Call the ObjectContext.Attach method before saving a Customer entity.
C) Add a handler for the ObjectContext.ObjectMaterialized event. In the event handler, set the CustomerKey value.
D) Add a handler for the ObjectContext.SavingChanges event. In the event handler, set the CustomerKey value.

4. You use Microsoft .NET Framework 4.0 to develop an application that connects to two separate Microsoft
SQL Server 2008 databases.
The Customers database stores all the customer information, and the Orders database stores all the order
information.
The application includes the following code. (Line numbers are included for reference only.)
01 try
02 {
03 conn.Open();
04 tran = conn.BeginTransaction("Order");
05 SqlCommand cmd = new SqlCommand();
06 cmd.Connection = conn;
07 cmd.Transaction = tran;
08 tran.Save("save1");
09 cmd.CommandText = "INSERT INTO [Cust].dbo.Customer " + "(Name,
PhoneNumber) VALUES ('Paul Jones', " + "'404-555-1212')";
10 cmd.ExecuteNonQuery();
11 tran.Save("save2");
12 cmd.CommandText = "INSERT INTO [Orders].dbo.Order " + "(CustomerID)
VALUES (1234)";
13 cmd.ExecuteNonQuery();
14 tran.Save("save3");
15 cmd.CommandText = "INSERT INTO [Orders].dbo." + "OrderDetail (OrderlD,
ProductNumber) VALUES" + "(5678, 'DC-6721')";
16 cmd.ExecuteNonQuery();
17 tran.Commit();
18 }
19 catch (Exception ex)
20 {
21 ...
22 }
You run the program, and a timeout expired error occurs at line 16. You need to ensure that the customer
information is saved in the database.
If an error occurs while the order is being saved, you must roll back all of the order information and save the
customer information.
Which line of code should you insert at line 21?

A) tran.Rollback(); tran.Commit();
B) tran.Rollback("save2"); tran.Commit();
C) tran.Rollback("save2");
D) tran.Rollback();

5. 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.
You create classes by using LINQ to SQL based on the records shown in the exhibit:

You need to create a LINQ query to retrieve a list of objects that contains the OrderID and CustomerID
properties.
You need to retrieve the total price amount of each Order record. What are two possible ways to achieve
this goal?
(Each correct answer presents a complete solution. Choose two.)

A) dataContext.Orders.GroupJoin(dataContext.Order_Detail, o => o.OrderID, d => d.OrderID,
(ord, dts) => new {
OrderID = ord.OrderID,
CustomerID = ord.CustomerID,
TotalAmount = dts.Sum(od => od.UnitPrice *
od.Quantity)
})
B) from order in dataContext.Orders group order by order.OrderID into g join details in dataContext.Order_Detail on g.Key equals details.OrderID
select new
{
OrderID = details.OrderID,
CustomerID = details.Order.CustomerID,
TotalAmount = details.UnitPrice * details.Quantity
}
C) from details in dataContext.Order_Detail group details by details.OrderID into g join order in dataContext.Orders on g.Key equals order.OrderID select new {
OrderID = order.OrderID,
CustomerID = order.CustomerID,
TotalAmount = g.Sum(od => od.UnitPrice * od.Quantity)
}
D) dataContext.Order_Detail.GroupJoin(dataContext.Orders, d => d.OrderID, o => o.OrderID,
(dts, ord) => new {
OrderID = dts.OrderID,
CustomerID = dts.Order.CustomerID,
TotalAmount = dts.UnitPrice * dts.Quantity
})

Solutions: