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Software Development using .NET

VB.NET (Loop Structure)Presented By:

Name : Abhishek PachisiaCourse : B.Tech-IT(Sem V)Roll No. : 090102801

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What is VB.NET?

•It is simply Visual Basic for .NET platform developed by Microsoft.

•It has more components and control than Visual Basic

VB.NET

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Visual Basic loop structures allow to run one or more lines of code repetitively

Statements in a loop structure can be repeated

Until a condition is TrueUntil a condition is FalseA specified number of times, or Once for each element in a collection.

Loop Structure

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Types of Looping:

There are mainly 3 types of loop:

For Loop

While Loop

Do Loop

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FOR Loop• The For loop is the most popular loop.

•For loops enable us to execute a series of expressions multiple numbers of times.

•Syntax:

For index=start to end[Step step][statements][Exit For][statements]Next[index]

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Example:

Module Module1

Sub Main()Dim d As IntegerFor d = 0 To 2System.Console.WriteLine("In the For

Loop")Next dEnd Sub

End Module

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While Loop

•While loop keeps executing until the condition against which it tests remain true.

•Syntax:

While condition[statements]End While

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Example:

Module Module1

Sub Main()Dim d, e As Integerd = 0e = 6While e > 4e -= 1d += 1End WhileSystem.Console.WriteLine("The Loop ran " & e

& "times")End Sub

End Module

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DO Loop•The Do loop keeps executing it's statements while or until the condition is true. •Two keywords, while and until can be used with the do loop. •The Do loop also supports an Exit Do statement which makes the loop to exit at any moment.

•Syntax:

Do[{while | Until} condition][statements][Exit Do][statements]Loop

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Example:

Module Module1

Sub Main()Dim str As StringDo Until str = "Cool"System.Console.WriteLine("What to

do?")str = System.Console.ReadLine()LoopEnd Sub

End Module

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