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Conditional Statement Prepared By :- Rahul Sharma Enrollment No. : 07521102013 Subject :- VB .NET Faculty :- Mr. Neeraj Mishra

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Page 1: If and select statement

Conditional Statement

Prepared By :- Rahul Sharma

Enrollment No. : 07521102013

Subject :- VB .NET

Faculty :- Mr. Neeraj Mishra

Page 2: If and select statement

Selection or Condition ConstructThe selection or decision construct means theexecution of statement(s) depending upon thecondition-test.

If a condition evaluates to True, a course-of-action (aset of statements) is followed otherwise anothercourse-of-action is followed.

This construct is also called decision construct as ithelps in decision making.

Page 3: If and select statement

Selection or Condition ConstructsVB provides two types of selection construct :

1. If statement

2. Select Case statement

The If Statement : If statement of VB comes in various forms & are given below:

1) If..Then Statement

2) If..Then..Else Statement

3) If..Then..ElseIf Statement

4) Nested Ifs

Page 4: If and select statement

If..Then StatementDefinition : An If..Then statement tests a particularcondition; if the condition evaluates to true, a course-of-action is followed otherwise it is ignored.

Syntax : If (boolean expression) Then

statementsEnd If

Example :If txtAge.Text>=18 Then

MsgBox(“You are eligible to vote”)End if

Page 5: If and select statement

If..Then..Else StatementIf..Then..Else statement provides an alternate choice to the useri.e. if the condition is true then a set of statements are executedotherwise another set of statements are executed.

Syntax :If (boolean Expression) Then

VB Statement(s)Else

VB Statement(s)End If

Example :If (txtAge.Text>=18) Then

MsgBox(“You are eligible to vote”)Else

MsgBox(“Sorry, You are not eligible to vote”)End If

Page 6: If and select statement

If..Then..ElseIf Statement

If..Then..ElseIf statement is used to test a number of mutuallyexclusive cases and only executes one set of statements for the casethat is true first.

Example:If (Age<=4) Then

MsgBox(“Your rate is free.”)ElseIf (Age<=12) Then

MsgBox(“You qualify for the children’s rate.”)ElseIf (Age<65) Then

MsgBox(“You must pay full rate”)Else

MsgBox(“You qualify for the seniors’ rate.”)End If

Syntax : If (Boolean Expression) ThenStatement(s)

ElseIf (Boolean Expression 2) ThenStatement(s)

ElseIf (Boolean Expression 3) ThenStatement(s)

:Else

Statement(s)End If

Page 7: If and select statement

Nested IfsA nested If is an if that has another If in its if ’s body or in itselse’s body.The nested if can have one of the following 3 forms :-

1. If (expression 1) Then If (expression 2 ) Then

Statement 1Else

Statement 2End If

Elsebody-of-else

End If

2. If (expression 1) Then

body-of-if

Else

:

If (expression 2) Then

Statement-1

Else

Statement-2

End If

Page 8: If and select statement

3. If (expression 1) Then:

If (expression 2) ThenStatement-1

ElseStatement-2

End IfElse

If (expression 3) ThenStatement-3

ElseStatement-4

: End If

End If

Example of Nested If:

If Num>0 Then

Msgbox(“It is a positive number”)

Else

If Num<0 Then

Msgbox(“It is a negative number”)

Else

Msgbox(“The number is equal to zero”)

End If

End If

Page 9: If and select statement

Select-Case StatementSelect-Case is a multiple branching statement and isused to executed a set of statements depending uponthe value of the expression.

It is better to use Select-Case statement in comparisonto If..Then..ElseIf Statement when the number ofchecks are more.

There are 3 different forms of using Select-Casestatements and are given below :

Page 10: If and select statement

Different forms of Select-Case

Select Case Expression

Case Value

’visual basic statements

Case Value

’visual basic statements

Case Else

’visual basic statements

End Select

1. Select Case : Simplest Form [Exact match]

Example :

Select Case byMonthCase 1,3,5,7,8,10,12

number_of_days=31Case 2

number_of_days=28Case Else

number_of_days=30End Select

Page 11: If and select statement

Select Case Expression

Case Is relation

’visual basic statements

Case Is relation

’visual basic statements

Case Else

’visual basic statements

End Select

Example:

Select Case marksCase Is < 50

Result = “Fail”Case Is < 60

Result = “Grade B”Case Is < 75

Result = “Grade A”Case Else

Result = “Grade A+”End Select

2.Select Case : Second Form [Relational Test]

Page 12: If and select statement

Select Case Expression

Case exp1 To exp2:

’visual basic statements

Case exp1 To exp2:

’visual basic statements

Case Else:

’visual basic statements

End Select

Example :

Select Case AgeCase 2 to 4 : Msgbox(“PreNursery”)Case 4 to 6 : Msgbox(“Kindergarden”)Case 6 to 10 : Msgbox(“Primary”)Case Else : Msgbox(“Others”)

End Select

3.Select Case : Third Format [Range Check]

Page 13: If and select statement

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