VB if..else..if


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

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

Example

Module decisions
   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
Output
None of the values is matching
Exact value of a is: 100

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