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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 database.
The application has two DataTable objects that reference the Customers and Orders tables in the
database.
The application contains the following code segment. (Line numbers are included for reference only.)
01 DataSet customerOrders = new DataSet();
02 customerOrders.EnforceConstraints = true;
03 ForeignKeyConstraint ordersFK = new ForeignKeyConstraint("ordersFK",
04 customerOrders.Tables
["Customers"].Columns["CustomerID"],
05 customerOrders.Tables["Orders"].Columns
["CustomerID"]);
06 ...
07 customerOrders.Tables["Orders"].Constraints.Add(ordersFK);
You need to ensure that an exception is thrown when you attempt to delete Customer records that have
related Order records.
Which code segment should you insert at line 06?

A) ordersFK.DeleteRule = Rule.Cascade;
B) ordersFK.DeleteRule = Rule.SetDefault;
C) ordersFK.DeleteRule = Rule.SetNull;
D) ordersFK.DeleteRule = Rule.None;

2. 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.
You need to create a database from your model. What should you do?

A) Use the Update Model Wizard in Visual Studio.
B) Run the edmgen.exe tool in FromSSDLGeneration mode.
C) Use the Generate Database Wizard in Visual Studio. Run the resulting script against a Microsoft SQL Server database.
D) Run the edmgen.exe tool in FullGeneration mode.

3. 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); 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); rdr.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); conn.Close(); Console.WriteLine("{0}", rdr);

4. 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 allows users to make changes to entities while disconnected from the central data store.
You need to ensure that when the user connects to the central data store and retrieves new data, the application meets the following requirements:
-Changes made to the local data store in disconnected mode are preserved.
-Entities that have already been loaded into the local data store, but have not been modified by the user,
are updated with the latest data. What should you do?

A) Call the Refresh method of ObjectContext by using the RefreshMode.StoreWins option.
B) Call the Refresh method of ObjectContext by using the RefreshMode.ClientWins option.
C) Call the query's Execute method by using the MergeOptions.OverwriteChanges option.
D) Call the query's Execute method by using the MergeOptions.AppendOnly option.

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 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) MD5CryptoServiceProvider
C) DSACryptoServiceProvider
D) SHA1CryptoServiceProvider

Solutions: