DECISION STATEMENTSIN

VB.NET

Introduction

• Decision making statements in VB.NET are used to

control the flow of a program by checking one or more

conditions. There are 3 types, They are

– If … then

– If …. Then … else

– Select case

If .. then

• This statement is used to test a condition and execute

a set of statements if the condition is true . If it is

false, the statement which is next to the if … then

structure is executed.

syntax

If Condition Then    One or more Visual Basic statementsEnd If

Example

Dim mark as integer

If mark>40 then

Msgbox (“Pass”)

End if

If … then … else

• This statement is used to test a condition and

execute a set of statements if the condition is

true and execute another set of statement if it

is false.

Syntax

If condition Then

  One or more statements

Else

  One or more statements

End If

Example

• Dim a As Integer

Dim b As Integer

a = 3

b = 4

If a > b Then

    MsgBox ("a is greater then b")

Else

    MsgBox ("b is greater then a")

End If

Select case statement

• The Select Case statement executes one of several

groups of statements depending on the value of an

expression. If your code has the capability to handle

different values of a particular variable then you can

use a Select Case statement. You use Select Case to

test an expression, determine which of the given cases

it matches and execute the code in that matched case.

Syntax • Select Case expression

   Case value1

        Statement 1

   Case value2

        Statement 2

   Case value3

      Statement 3

   Case value4

        .

        .

        .

   Case Else

        Statement

End Select

Example • ' Examination Grades

Dim grade As String Private Sub Compute_Click( )     grade= txtgrade.Text     Select Case grade       Case  "A"            result.Caption="High Distinction"       Case "A-"           result.Caption="Distinction"       Case "B"             result.Caption="Credit"       Case "C"             result.Caption="Pass"       Case Else             result.Caption="Fail"       End Select End Sub

The End.

… Thank u…