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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 connects to a Microsoft SQL Server 2008 database. You add the following store procedure
to the database.
CREATE PROCEDURE GetProducts AS BEGIN
SELECT ProductID, Name, Price, Cost FROM Product END
You create a SqlDataAdapter named adapter to execute the stored procedure. You need to fill a DataTable
instance with the first 10 rows of the result set.
What are two possible code segments that you can use to achieve the goal?

A) DataSet ds = new DataSet(); adapter.Fill(ds, 0, 10, "Product");
B) DataSet ds = new DataSet(); DataTable dt = ds.Tables.Add("Product"); dt.ExtendedProperties["RowCount"] = 10; dt.ExtendedProperties["RowIndex"] = 0; adapter.Fill(dt);
C) DataSet ds = new DataSet(); DataTable dt = ds.Tables.Add("Product"); adapter.Fill(0, 10, dt);
D) DataSet ds = new DataSet(); ds.ExtendedProperties["RowCount"] = 10; ds.ExtendedProperties["RowIndex"] = 0; adapter.Fill(ds);

2. 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.
The application uses the following object query to load a product from the database.
(Line numbers are included for reference only.)
01 using (AdventureWorksEntities advWorksContext = new AdventureWorksEntities
())
02 {
03 ObjectQuery <Product> productQuery = advWorksContext.Product.Where
("it.ProductID = 900");
04 ...
05 }
You need to log the command that the query executes against the data source. Which code segment should you insert at line 04?

A) Trace.WriteLine(productQuery.ToTraceString());
B) Trace.WriteLine(((IQueryable)productQuery).Expression);
C) Trace.WriteLine(productQuery.CommandText);
D) Trace.WriteLine(productQuery.ToString());

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)
01 class DataAccessLayer
02 {
03 private static string connString;
04 ...
05 ...
06 public static DataTable GetDataTable(string command){
07 ...
08 ...
09 }
10 }
You need to define the connection life cycle of the DataAccessLayer class.
You also need to ensure that the application uses the minimum number of connections to the database.
What should you do?

A) Insert the following code segment at line 04.
private static SqlConnection conn = new SqlConnection(connString);
public static void Open()
{
conn.Open();
}
public static void Close()
{
conn.Close();
}
B) Replace line 01 with the following code segment.
class DataAccessLayer : IDisposable
Insert the following code segment to line 04.
private SqlConnection conn = new SqlConnection(connString);
public void Open()
{
conn.Open();
}
public void Dispose()
{
conn.Close();
}
C) Insert the following code segment at line 07:
using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open();
}
D) Insert the following code segment at line 04.
private SqlConnection conn = new SqlConnection(connString);
public void Open()
{
conn.Open();
}
public void Close()
{
conn.Close();
}

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. The application stores encrypted credit card
numbers in the database.
You need to ensure that credit card numbers can be extracted from the database.
Which cryptography provider should you use?

A) SHA1CryptoServiceProvider
B) AESCryptoServiceProvider
C) DSACryptoServiceProvider
D) MD5CryptoServiceProvider

5. 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.

Solutions: