Visual Basic. NET (VB.NET)

Visual Basic. NET (VB.NET) is a language of object-oriented programming can consider changes implemented on the Visual Basic. NET framework.

As with all programming languages. NET-based, programs written in VB. NET Framework require the. NET to run.

Features (Visual Basic 6.0 does not own):

• Heritage
• Polymorphism
• Encapsulation

The Visual Studio 2008 to work against 3. NET different frameworks:

. NET Framework 2.0

. NET Framework 3.0

. NET Framework 3.5

It is also very easy to use with hardware development.

In addition, integrating the ASP.NET AJAX framework for developing AJAX.

Components. NET Framework:

• CLR (Common Language Runtime)
• Class library. NET Framework
• ADO.NET: Data and XML
• ASP.NET: Forms and Web services
• User Interface

  

Visual Basic Type	Structure common language runtime	Nominal storage allocation	Range of values
Boolean	Boolean	Depending on the deployment platform	True or False
Byte	Byte	1 byte	0 to 255 (unsigned)
Char (single character)	Char	2 bytes	0 to 65535 (unsigned)
Date	DateTime	8 bytes	0:00:00 (midnight) on January 1, 0001 at 11:59:59 pm on December 31, 9999.
Decimal	Decimal	16 bytes	0 to + / -79,228,162,514,264,337,593,543,950,335 (+ / -7.9 ... E +28) † with no decimal point, 0 to + / -7.9228162514264337593543950335 with 28 places to the right of the decimal; nonzero numbers smaller + / -0.0000000000000000000000000001 (+ /-1E-28) †
Double (double precision floating point)	Double	8 bytes	E -1.79769313486231570 -4.94065645841246544 +308 to E-324 † for negative values; 4.94065645841246544 E-324-1.79769313486231570 E +308 †for positive values
Integer	Int32	4 bytes	-2,147,483,648 To 2,147,483,647 (signed)
Long (long integer)	Int64	8 bytes	-9,223,372,036,854,775,808 To 9,223,372,036,854,775,807 (9.2 ... E +18 †) (signed)
Object	Object (class)	4 bytes in 32-bit platform 8 bytes on 64-bit platform	Any type can be stored in a variable of type Object
SByte	SByte	1 byte	-128 To 127 (signed)
Short (short integer)	Int16	2 bytes	-32,768 To 32,767 (signed)
Single (single-precision floating point)	Single	4 bytes	-1.401298 -3.4028235 E +38 to E-45 † for negative values; 1.401298 E-45 to 3.4028235 E +38 † for positive values
String (variable length)	String (class)	Depending on the deployment platform	0 to 2,000 million Unicode characters approx.
UInteger	UInt32	4 bytes	0 to 4,294,967,295 (unsigned)
ULong	UInt64	8 bytes	0 to 18,446,744,073,709,551,615 (1.8 ... E +19 †) (unsigned)
User-Defined (structure)	(Inherited deValueType)	Depending on the deployment platform	Each member of the structure has a range of values ​​determined by its data type and is independent of the range of values ​​for the other members.
UShort	UInt16	2 bytes	0 to 65,535 (unsigned)

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• Summary of Visual Basic.NET

• Major changes to take advantage of. NET famework
• Streamlined and consistent language.
• Characteristics "inherited" have finally been removed.
• Visual Basic.NET code can be reused.
• Support for migration.