You are creating an undo buffer that stores data modifications. You need to ensure that the undo functionality undoes the most recent data modifications first. You also need to ensure that the undo buffer permits the storage of strings only.
Which code segment should you use?

You need to write a code segment that will add a string named strConn to the connection string section of the application configuration file.
Which code segment should you use?

You are writing a method to compress an array of bytes. The array is passed to the method in a parameter named document. You need to compress the incoming array of bytes and return the result as an array of bytes.
Which code segment should you use?

You are developing an application that will use custom authentication and role-based security. You need to write a code segment to make the runtime assign an unauthenticated principal object to each running thread.
Which code segment should you use?

You create a DirectorySecurity object for the working directory. You need to identify the user accounts and groups that have read and write permissions.
Which method should you use on the DirectorySecurity object?

You are creating an assembly named Assembly1. Assembly1 contains a public method. The global cache contains a second assembly named Assembly2. You must ensure that the public method is only called from Assembly2.
Which permission class should you use?

You are creating a Windows Forms application that includes the database
helper methods UpdateOrder and UpdateAccount. Each method wraps code that connects to a Microsoft SQL Server 2005 database, executes a Transact-SQL statement, and then disconnects from the database. You must ensure that changes to the database that result from the UpdateAccount method are committed only if the UpdateOrder method succeeds. You need to execute the UpdateAccount method and the UpdateOrder method.
Which code segment should you use?

A Windows Forms application contains the following code segment.

string SQL = @”SELECT OrderID, ProductID, UnitPrice, Quantity FROM [Order Details]”;
SqlDataAdapter da = new SqlDataAdapter(SQL, connStr);
DataTable dt = new DataTable();
da.Fill(dt);

You need to add a new column to the data table named ItemSubtotal. The ItemSubtotal column must contain the value of the UnitPrice column multiplied by the value of the Quantity column.
Which code segment should you use?

A Windows Forms application reads the following XML file.

<?xml version=”1.0″?>
<x:catalog xmlns:x=”urn:books”>
<book id=”bk101″>
<author>Gambardella, Matthew</author>
<title>XML Developer’s Guide</title>
</book>
<book id=”bk102″>
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
</book>
</x:catalog>

The form initialization loads this file into an XmlDocument object named docBooks. You need to populate a ListBox control named lstBooks with the concatenated book ID and title of each book.
Which code segment should you use?

You are creating a class that uses unmanaged resources. This class maintains references to managed resources on other objects. You need to ensure that users of this class can explicitly release resources when the class instance ceases to be needed.
Which three actions should you perform? (Each correct answer presents part of the solution. Choose three.)