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

1. You have a ContosoEntities context object named context and a Color object stored in a variable named color.
You write the following code:
context.Colors.DeleteObject(color); context.SaveChanges();
When the code runs, it generates the following exception:
System.Data.UpdateException: An error occurred while updating the entries. See
the inner exception for detials. --->
System.Data.SqlClient.SqlException: The DELETE satement conflicted with the
REFERENCE constraint "FK_PartColor".
The conflict occurred in database "Contoso", table "dbo.Parts", column
'ColorId'
You need to resolve the exception without negatively impacting the rest of the application. What should you do?

A) In the database, remove the foreign key association between the Parts table and the Colors table, and then update the entity data model.
B) Add a transation around the call to the SaveChanges() method and handle the exception by performing a retry.
C) Add code before the call to the DeleteObject() method to examine the collection of Part objects associated with the Color object and then assign null to the Color property for each Part object.
D) Change the End1 OnDelete proprety of the FK_PartColor association from None to Cascade
E) Change the End2 OnDelete proprety of the FK_PartColor association from None to Cascade

2. The application must be configured to run on a new development computer.
You need to configure the connection string to point to the existing named instance.
Which connection string fragment should you use?

A) Initial Catalog= SQL01\INST01
B) Data Source=SQL01\INST01
C) Data Source=INST01\SQL01
D) Initial Catalog= INST01\SQL01

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 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) AESCryptoServiceProvider
B) DSACryptoServiceProvider
C) MD5CryptoServiceProvider
D) SHA1CryptoServiceProvider

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You are creating the data layer of the application. You write the following code segment.
(Line numbers are included for reference only.)
01 public static SqlDataReader GetDataReader(string sql)
02 {
03 SqlDataReader dr = null;
04 ...
05 return dr;
06 }
You need to ensure that the following requirements are met: The SqlDataReader returned by the GetDataReader method can be used to retreive rows from the database.
--
SQL connections opened within the GetDataReader method will close when the SqlDataReader is closed.
Which code segment should you insert at the line 04?

A) SqlConnection cnn = new SqlConnection(strCnn); SqlCommand cmd = new SqlCommand(sql, cnn); cnn.Open(); { try { dr = cmd.ExecuteReader(); } finally {
cnn.Close();
}
}
B) SqlConnection cnn = new SqlConnection(strCnn); SqlCommand cmd = new SqlCommand(sql, cnn);
cnn.Open();
{
try
{
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
catch
{
cnn.Close();
throw;
}
}
C) using(SqlConnection cnn = new SqlConnection(strCnn)) { try { SqlCommand cmd = new SqlCommand(sql, cnn); cnn.Open(); dr = cmd.ExecuteReader(); } catch {
throw;
}
}
D) SqlConnection cnn = new SqlConnection(strCnn); SqlCommand cmd = new SqlCommand(sql, cnn); cnn.Open(); { try { dr = cmd.ExecuteReader(); cnn.Close(); } catch {
throw;
}
}

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.
SQLConnection conn = new SQLConnection(connectionString);
conn.Open();
SqlTransaction tran = db.BeginTransaction(IsolationLevel. ...);
...
You must retrieve not commited records originate from various transactions. Which method should you use?

A) RepeatableRead
B) ReadUncommited
C) Serializable
D) ReadCommited

Solutions: