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Teach Yourself Visual Studio® .NET 2003 in 21 Days [Electronic resources] - نسخه متنی

Jason Beres

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• Table of Contents

• Index

Sams Teach Yourself Visual Studio® .NET 2003 in 21 Days

By

Jason Beres

Publisher : Sams Publishing

Pub Date : January 14, 2003

ISBN : 0-672-32421-0

Pages : 696

Sams Teach Yourself Visual Studio .NET in 21 Days will help developers that are new to application development and experienced developers understand how to use the .NET Framework and Visual Studio .NET to rapidly develop any type of computer application. The Visual Studio .NET development environment is the most comprehensive developer tool ever created, putting that together with the .NET Frameworks' Class Libraries, the developer has everything he or she needs to get up-to-speed on Microsoft's latest revolution in application development. This book will guide the developer through using the VS .NET IDE, the Visual Basic .NET and C# language, and the supporting tools available from Microsoft to create Windows and Web-based applications. The market is full of books that pretty much say the same thing, which is already available in the help files, the author of this book has written and deployed over a dozen successful applications using Visual Studio .NET and the .NET Framework. All of his expertise and experience is used to give you the most comprehensive title on using Visual Studio .NET.
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Understanding CLS Data Types in Visual Basic .NET and C#


When working with data, such as setting or retrieving values from a form, you must normally take that information and either manipulate it or store it temporarily before you persist it to a database or a file.

In C# and Visual Basic .NET, you use variables to store information. Each variable that you declare is of a certain type, which is defined by the rules of the common type system (CTS). The CTS guarantees type safety between different languages, which was unheard of before .NET. That means when you use a String data type in C#, it's the same String data type that you use in Visual Basic .NET and COBOL .NET.

When I talk about different .NET languages, I mean that a language is considered a .NET language because it follows the rules of the Common Language Specification (CLS). The CTS exists in the CLS, which ensures type safety across all languages that have a .NET suffix. The allowable data types, their language-specific syntax, their CLS type, and their value ranges are listed in Table 8.1.








































































































Table 8.1. Data Types in .NET

Visual Basic .NET


C#


CLS Type


Bytes


Value


Boolean


bool


System.Boolean


4


True or False.


Byte


byte


System.Byte


1


0 to 255.


Char


char


System.Char


2


0 to 65,535.


Date


DateTime


System.DateTime


8


January 1, 1 to December 31, 9999.


Decimal


decimal


System.Decimal


12


+/- 79,228,162,514,264,337,593,950,335 with no decimal point.

+/- 7.9228162512264337593543950335 with 28 places to the right of the decimal point.

The smallest nonzero number would be a 1 in the 28th position to the right of the decimal point.


Double


double


System.Double


8


-1.797693134862231E308 to -4.94065645841247 for negative values to 4.94065645841247 to 1.797693134862231E308 for positive values.


Integer


int


System.Int32


4


-2,147,483,648 to 2,147,483,648.


Long


long


System.Int64


8


-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.


Short


short


System.Int16


2


-32,768 to 32,767.


Object


object


System.Object


4


An object can hold any variable type.


Single


float


System.Single


4


-3.402823E38 to -1.401298E-45 for negative values to 1.401298E-45 to 3.402823E38 for positive values.


String


string


System.String


10

+

(2*Length)


0 to 2 billion Unicode characters (approximately).


User-defined type (structure)


struct


System.ValueType


Sum

of

the size

of its

members


Each member of the structure has a range determined by its data type and independent of the ranges of the other members.

Note

If you're coming from a Visual Basic 6 background, notice the differences in the data type ranges. In Visual Basic .NET, the Short data type replaces the Integer data type, and the Integer data type replaces the Long data type. The Long data type in Visual Basic .NET is a 64-bit number; in Visual Basic 6, a Long data type was a 32-bit number.

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