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   ► KBProgrammingVB.NetTool Basics   Print This    All Groups  
  From the August 2015 Issue of Prestwood eMag
 
VB.Net Tool Basics:
VB.Net Constants (Const kPI Double = 3.1459)
 
Posted 13 years ago on 12/16/2008 and updated 10/24/2009
VB.Net Code Snippet:
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 Tags: VB.Net , Constants

KB101709

General Info: Computer Language Constants

A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

VB.Net Constants

In VB.Net, you define constants with the Const keyword.

All constants are part of a class (no global constants) but you can make a constant public and have access to it using ClassName.ConstantName so long as you have added the class to the project. This works even without creating the class as if the public constants were static, but you cannot use the Shared keyword.

Constants must be of an integral type (sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, decimal, bool, or string), an enumeration, or a reference to null.

Syntax Example:
Public Class Convert
Inherits System.Object
 
  Public Const kName As String = "Mike"
  Private Const kPI Double = 3.1459
 
  //Declare two or more on same line too:
Const kFeetToMeter = 3.2808, kMeterToFeet = 0.3048
End Class

More Info

Definition:  Computer Language Constants

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Beginner

1 Beginner Level Question

Question #1: Multiple Choice

Which statement best describes VB.Net constants?

Answer:
1. 

In VB.Net, you define constants with the Const keyword. All constants are part of a class (no global constants) but you can make a constant public and have access to it using ClassName.ConstantName so long as you have added the class to the project. This works even without creating the class as if the public constants were static, but you cannot use the Shared keyword.

2. 

In VB.Net, you define constants with the Constant keyword. All constants are part of a class but you can have special global constants by making use of the special _Global class.

3. 

In VB.Net, you define constants with the Literal keyword. All constants are part of a class (no global constants) and you must create a class prior to accessing the constant using ClassName.ConstantName.

4. 

In VB.Net, you define constants with the Const keyword. You can declare constants witin a class or globally outside a class. For class constants, you can have access to it using ClassName.ConstantName so long as you have added the class to the project.


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