dot net coaching step by step

COMPILATION & EXECUTION

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TO COMPILE & EXECUTE ANY .NET PROGRAM PRESS "F5"

OR PRESS THE PLAY BUTTON ON THE STANDARD TOOLBAR.

FIRST PROGRAM ON VB.NET

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' MY FIRST APPLICATION IN VB.NET CONSOLE 05/DEC/09

Imports System.Console   ' THIS IS A NAMESPACE TO HAVE CONSOLE PROGRAM COMPILED.

Module Module1

    Sub Main()    ' THIS IS THE MAIN PROCEDURE WHERE THE EXECUTION STARTS WITH

        WriteLine("WELCOME TO VB.NET CONSOLE PROGRAMS!!!")

        Read()  ' READS A CHARACTER

    End Sub

End Module

Imports System.Console   ' THIS IS A NAMESPACE TO HAVE CONSOLE PROGRAM COMPILED.

Module Module1

    Sub Main()

        Dim A, B, C As Integer

        A = 10

        B = 20

        C = A + B

        WriteLine("THE SUM IS : " & C)

        Read()

    End Sub

End Module

IN THE ABOVE PROGRAM WE HAVE ADDED TWO NUMBERS IMPLICITY(VALUES GIVEN IN THE DESIGN TIME).

 ...we will continue in next session..if interested visit:

http://learn-dotnet-sts.blogspot.com/

Till now we were writing the program in c,c++,Java,etc.

All these are programming languages we know.

But coming to .NET we have three things

VB.NET, C#.net, ASP.NET

Vb.net & C#.net are used to develop programs/project/applications in Character user interface, graphical user interface.

So, Now we will create a console applications in vb.net

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START->PROGRAMS->MS VISUAL STUDIO 2008->MS VS 2008

FILE->NEW->PROJECT

VISUAL BASIC .NET WITH CONSOLE WE WILL GET A DEFAULT CODE AS FOLLOWS:

***********************

MODULE MODULE1

                SUB MAIN()

                END SUB

END MODULE

***********************

WHAT IS STRUCTURE OF THE VB.NET PROGRAMS?

COMMENTS

LIBRARIES(NAMESPACES)

MODULE

                MAIN PROCEDURE

CLASSES

INTERFACES

COMMENTS:

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IT IS USED FOR DOCUMENTATION PURPOSE LIKE AUTHOR NAME, REASON OF WRITING CODE, LINKINGS, DATE , ETC.

IN VB.NET FOR SINGLE LINE (') SINGLE QUOTE.

FOR MULTIPLE LINE /* ---------------*/

AND THESE COMMENTS ARE NOT COMPILED/INTERPRETED.

NAMESPACES:

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THESE ARE LIBRARIES FOR OUR PROGRAMS IN VB.NET.

IN VB.NET WE USE "IMPORTS" AS THE KEYWORD.

WE USE LIBRARIES IN THE FOLLOWING FORMAT:

SYNTAX:

-------

IMPORTS NAMESPACENAME

EX:

IMPORTS SYSTEM.CONSOLE

IMPORTS SYSTEM.DATA

IMPORTS SYSTEM.XML

IMPORTS SYSTEM.WINDOWS

IMPORTS SYSTEM.WEB

DATATYPES:

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VALUES ARE TO BE STORED IN THE MEMORY IN A FORMAT. WE HAVE DIFFERENT FORMATS OF STORING THE DATA. I.E

INTEGER              2             

DOUBLE               4

STRING 4

BOOLEAN            1

OBJECT(IMAGES, XL SHEETS, WORD FILES) 1 GB

DECLARATION OF VARIABLES:

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in vb.net we declare the variable in the following format:

dim variablename as datatype

ex:

dim a as integer

"dim" means dimensions of the variables.

dim a,b,c as integer

dim x as string

dim s as double

INPUT/OUTPUT

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IN VB.NET ALSO WE HAVE I/O OPERATIONS DONE BY

WRITELINE() - PRINTS IN NEW LINE

WRITE()     - PRINTS IN SAME LINE

READLINE()  - READS SET OF CHARACTERS

READ()      - READS ONLY ONE CHAR.

 ....we will continue in next session

more intrested visit:  http://learn-dotnet-sts.blogspot.com/