Visual Basic 2005 in a Nutshell, Third Edition

Changes to Programming Elements | 699

What’s New

2002

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

color constants vbRed and vbBlue, are no longer directly supported. The color

constants are part of the System.Drawing namespace’s Color structure and are

accessed as follows:

Me.BackColor = System.Drawing.Color.BlanchedAlmond

When using most constants, other than those in the Microsoft.VisualBasic.

Constants class, you will need to include some or all of their namespace and class

name prefix. For example, the

vbYes constant in VB 6 continues to exist in VB.NET

as a member of the

MsgBoxResult enumeration. It can be used as follows:

If (MsgBoxResult.Yes = MsgBox("OK to proceed?", ...

For a list of built-in constants and enumerations, see Appendix C.

String Functions

The String function has been removed from VB.NET. Its functionality now

appears as part of the

String data-type constructor.

Dim giveThemAnA As New String("A"c, 5)

which defines a string containing five As. The c modifier in "A"c indicates a char-

acter literal (data type

Char) as opposed to a standard one-character string (data

type

String).

Emptiness

In VB 6, the Empty keyword indicated an uninitialized variable, and the Null

keyword was used when a variable contained no valid data. VB.NET does not

support either keyword but uses the

Nothing keyword in both of these cases. The

Null ...