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Decision statements

VB.NET provides 3 decision statements

  1. If ..then
  2. Syntax:
    If Expression1 Then
    ‘This statement block is executed if Expression1 is true
    End If

  3. If..then..else
  4. Syntax:
    If Expression1 Then
    ‘This statement block is executed if Expression1 is true
    Else
    ‘This statement block is executed if Expression1 is
    false
    End If

  5. Select..Case
  6. Syntax:
    Select Expression1
    case 1
    ‘ statement block for case 1
    case 2
    ‘ statement block for case 2
    case n
    ‘ statement block for case n
    case Else
    ‘ statement block if none of the case match
    End Select

    Loop structures supported by VB. NET
    1. While
    2. Syntax:
      While Expression
        Statement block
      End While
      Dim Counter As Integer = 0
      Dim Number As Integer = 10
      While Number > 6
      Number = Number – 1
      Counter = Counter + 1
      End While



      Example:
      Dim Counter As Integer = 0
      Dim Number As Integer = 10
      While Number > 6
      Number = Number – 1
      Counter = Counter + 1
      End While
    3. Do..Loop
    4. Syntax:
      Do
         Statement Block
      Loop While Expression



      Example:
      Dim Counter As Integer =0
      Dim Number As Integer =10
      Do While Number > 6
      Number = Number - 1
      Counter = Counter + 1
      Loop
    5. For..Next
    6. Syntax:
      For Loop Counter = Start Value To End Value [Step value]
         ‘statement block
      Next [Loop Counter]
      Example:
      Dim J, Total As Integer
      For J = 2 To 10 Step 2
      Total = Total + J
      Next J

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