Private Sub radioButton1_CheckedChanged(sender As Object, e As EventArgs)
    ' Change the check box position to be opposite its current position.
    If radioButton1.CheckAlign = ContentAlignment.MiddleLeft Then
        radioButton1.CheckAlign = ContentAlignment.MiddleRight
    Else
        radioButton1.CheckAlign = ContentAlignment.MiddleLeft
    End If
End Sub

Option Strict On

Imports System.Windows.Forms

public class RadioButtonState
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
   Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

   Public Sub New()
      MyBase.New()

      'This call is required by the Windows Form Designer.
      InitializeComponent()

      'Add any initialization after the InitializeComponent() call

   End Sub

   'Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If disposing Then
         If Not (components Is Nothing) Then
            components.Dispose()
         End If
      End If
      MyBase.Dispose(disposing)
   End Sub
   Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
   Friend WithEvents RadioButton1 As System.Windows.Forms.RadioButton
   Friend WithEvents RadioButton2 As System.Windows.Forms.RadioButton
   Friend WithEvents RadioButton3 As System.Windows.Forms.RadioButton
   Friend WithEvents Button1 As System.Windows.Forms.Button

   'Required by the Windows Form Designer
   Private components As System.ComponentModel.IContainer

   'NOTE: The following procedure is required by the Windows Form Designer
   'It can be modified using the Windows Form Designer.  
   'Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
      Me.GroupBox1 = New System.Windows.Forms.GroupBox()
      Me.RadioButton3 = New System.Windows.Forms.RadioButton()
      Me.RadioButton2 = New System.Windows.Forms.RadioButton()
      Me.RadioButton1 = New System.Windows.Forms.RadioButton()
      Me.Button1 = New System.Windows.Forms.Button()
      Me.GroupBox1.SuspendLayout()
      Me.SuspendLayout()
      '
      'GroupBox1
      '
      Me.GroupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.RadioButton3, Me.RadioButton2, Me.RadioButton1})
      Me.GroupBox1.Location = New System.Drawing.Point(40, 32)
      Me.GroupBox1.Name = "GroupBox1"
      Me.GroupBox1.Size = New System.Drawing.Size(240, 160)
      Me.GroupBox1.TabIndex = 0
      Me.GroupBox1.TabStop = False
      Me.GroupBox1.Text = "Choose a button:"
      '
      'RadioButton3
      '
      Me.RadioButton3.Location = New System.Drawing.Point(40, 104)
      Me.RadioButton3.Name = "RadioButton3"
      Me.RadioButton3.Size = New System.Drawing.Size(144, 24)
      Me.RadioButton3.TabIndex = 2
      Me.RadioButton3.Text = "RadioButton3"
      '
      'RadioButton2
      '
      Me.RadioButton2.Location = New System.Drawing.Point(40, 64)
      Me.RadioButton2.Name = "RadioButton2"
      Me.RadioButton2.Size = New System.Drawing.Size(144, 24)
      Me.RadioButton2.TabIndex = 1
      Me.RadioButton2.Text = "RadioButton2"
      '
      'RadioButton1
      '
      Me.RadioButton1.Checked = True
      Me.RadioButton1.Location = New System.Drawing.Point(40, 32)
      Me.RadioButton1.Name = "RadioButton1"
      Me.RadioButton1.Size = New System.Drawing.Size(144, 24)
      Me.RadioButton1.TabIndex = 0
      Me.RadioButton1.TabStop = True
      Me.RadioButton1.Text = "RadioButton1"
      '
      'Button1
      '
      Me.Button1.Location = New System.Drawing.Point(56, 216)
      Me.Button1.Name = "Button1"
      Me.Button1.Size = New System.Drawing.Size(168, 23)
      Me.Button1.TabIndex = 1
      Me.Button1.Text = "Which is Selected?"
      '
      'Form1
      '
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(292, 266)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.GroupBox1})
      Me.Name = "Form1"
      Me.Text = "Form1"
      Me.GroupBox1.ResumeLayout(False)
      Me.ResumeLayout(False)

   End Sub

#End Region

   Private Sub RadioButton1_CheckedChanged(ByVal sender As Object, _
       ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged, _
       RadioButton2.CheckedChanged, RadioButton3.CheckedChanged
   End Sub

   Private Sub Button1_Click(ByVal sender As Object, _
       ByVal e As System.EventArgs) Handles Button1.Click
      Dim c As Object
      For Each c In Me.GroupBox1.Controls
         If TypeOf (c) Is RadioButton Then
            Dim rb As RadioButton = CType(c, RadioButton)
            If rb.Checked = True Then
               MsgBox(CStr(rb.Name) & " is selected")
               Exit For
            End If
         End If
      Next

   End Sub
End Class