VB.Net - Nested If Statements

VB.Net - Nested If Statements

It is always legal in VB.Net to nest If-Then-Else statements, which means you can use one If or ElseIf statement inside another If ElseIf statement(s).

Syntax

The syntax for a nested If statement is as follows −

If( boolean_expression 1)Then

   'Executes when the boolean expression 1 is true 

   If(boolean_expression 2)Then

         'Executes when the boolean expression 2 is true 

   End If

End If

VB.NET PROGRAM

Module Module1

   Sub Main()

      'local variable definition

      Dim a As Integer = 100

      Dim b As Integer = 200

      ' check the boolean condition   

      If (a = 100) Then

         ' if condition is true then check the following 

         If (b = 200) Then

            ' if condition is true then print the following 

            Console.WriteLine("Value of a is 100 and b is 200")

         End If

      End If

      Console.WriteLine("Exact value of a is : {0}", a)

      Console.WriteLine("Exact value of b is : {0}", b)

      Console.ReadLine()

   End Sub

End Module

When the above code is compiled and executed, it produces the following result −

Value of a is 100 and b is 200

Exact value of a is : 100

Exact value of b is : 200

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The If...Else If...Else Statement

The If...Else If...Else Statement

An If statement can be followed by an optional Else if...Else statement, which is very useful to test various conditions using single If...Else If statement.

When using If... Else If... Else statements, there are few points to keep in mind.

• An If can have zero or one Else's and it must come after an Else If's.
• An If can have zero to many Else If's and they must come before the Else.
• Once an Else if succeeds, none of the remaining Else If's or Else's will be tested.

Syntax

The syntax of an if...else if...else statement in VB.Net is as follows −

If(boolean_expression 1)Then
   ' Executes when the boolean expression 1 is true 
ElseIf( boolean_expression 2)Then
   ' Executes when the boolean expression 2 is true 
ElseIf( boolean_expression 3)Then
   ' Executes when the boolean expression 3 is true 
Else 
   ' executes when the none of the above condition is true 
End If

VB.NET PROGRAM

Module Module1
   Sub Main()
      'local variable definition '
      Dim a As Integer = 100
      ' check the boolean condition '
      If (a = 10) Then
          ' if condition is true then print the following '
          Console.WriteLine("Value of a is 10") '
      ElseIf (a = 20) Then
          'if else if condition is true '
          Console.WriteLine("Value of a is 20") '
      ElseIf (a = 30) Then
          'if else if condition is true  
          Console.WriteLine("Value of a is 30")
      Else
          'if none of the conditions is true 
          Console.WriteLine("None of the values is matching")
      End If
      Console.WriteLine("Exact value of a is: {0}", a)
      Console.ReadLine()
   End Sub
End Module


When the above code is compiled and executed, it produces the following result −
None of the values is matching
Exact value of a is: 100.

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VB.Net - If...Then...Else Statement

VB.Net - If...Then...Else Statement

An If statement can be followed by an optional Else statement, which executes when the Boolean expression is false.

Syntax

The syntax of an If...Then... Else statement in VB.Net is as follows −

If(boolean_expression)Then
   'statement(s) will execute if the Boolean expression is true 
Else
  'statement(s) will execute if the Boolean expression is false 
End If

If the Boolean expression evaluates to true, then the if block of code will be executed, otherwise else block of code will be executed.

VB.NET PROGRAM

Module Module1
   Sub Main()
       'local variable definition '
      Dim a As Integer = 100
      ' check the boolean condition using if statement 
      If (a < 20) Then
          ' if condition is true then print the following 
          Console.WriteLine("a is less than 20")
      Else
          ' if condition is false then print the following 
          Console.WriteLine("a is not less than 20")
      End If
      Console.WriteLine("value of a is : {0}", a)
      Console.ReadLine()
   End Sub
End Module


When the above code is compiled and executed, it produces the following result −
None of the value is matching
value of a is : 100 

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VB.Net - If...Then Statement

It is the simplest form of control statement, frequently used in decision making and changing the control flow of the program execution. Syntax for if-then statement is −

If condition Then 
[Statement(s)]
End If

Where, condition is a Boolean or relational condition and Statement(s) is a simple or compound statement. Example of an If-Then statement is −

If (a <= 20) Then
   c= c+1
End If

If the condition evaluates to true, then the block of code inside the If statement will be executed. If condition evaluates to false, then the first set of code after the end of the If statement (after the closing End If) will be executed.

VB.NET PROGRAM 

Module Module1
   Sub Main()
      'local variable definition 
      Dim a As Integer = 10
      ' check the boolean condition using if statement 
      If (a < 20) Then
         ' if condition is true then print the following 
         Console.WriteLine("a is less than 20")
      End If
      Console.WriteLine("value of a is : {0}", a)
      Console.ReadLine()
    End Sub
End Module


When the above code is compiled and executed, it produces the following result −

a is less than 20
value of a is : 10





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VB.Net program

VB.Net PROGRAM

VB.Net Hello World Example

Let us look at a simple code that would print the words "Hello World" −

Imports System
Module Module1
   'This program will display Hello World 
   Sub Main()
      Console.WriteLine("Hello World")
      Console.ReadKey()
   End Sub
End Module

When the above code is compiled and executed, it produces the following result −

Hello, World!

RESULT

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