Visual Basic 2015 Unleashed

Conditional Code Blocks

If..Then..Else

If..Then..Else is the most classical block for conditionally executing actions. An If evaluates an expression as True or False and, according to this, allows you to specify actions that should take place. Listing 4.7 shows an example.

LISTING 4.7 Demonstrating the If..Then..Else Block

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Sub IfThenElseDemo()    Console.WriteLine("Type a number")    'Assumes users type a valid number    Dim number As Double = CDbl(Console.ReadLine)    If number >= 100 Then        Console.WriteLine("Your number is greater than 100")    ElseIf number < 100 AndAlso number > 50 Then        Console.WriteLine("Your number is less than 100 and greater than 50")    Else        'General action        Console.WriteLine("Your ...