RadioButton.CheckedChanged イベントとは？ わかりやすく解説

Public Event CheckedChanged As
 EventHandler

Dim instance As RadioButton
Dim handler As EventHandler

AddHandler instance.CheckedChanged, handler

public event EventHandler CheckedChanged

public:
event EventHandler^ CheckedChanged {
    void add (EventHandler^ value);
    void remove (EventHandler^ value);
}

/** @event */
public void add_CheckedChanged (EventHandler
 value)

/** @event */
public void remove_CheckedChanged (EventHandler
 value)

JScript では、イベントは使用できますが、新規に宣言することはできません。

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

private void radioButton1_CheckedChanged(Object
 sender, 
                                         EventArgs e)
{
   // Change the check box position to be opposite its current position.
   if (radioButton1.CheckAlign == ContentAlignment.MiddleLeft)
   {
      radioButton1.CheckAlign = ContentAlignment.MiddleRight;
   }
   else
   {
      radioButton1.CheckAlign = ContentAlignment.MiddleLeft;
   }
}

private:
   Void radioButton1_CheckedChanged( System::Object^ sender,
      System::EventArgs^ e )
   {
      // Change the check box position to be opposite its current position.
      if ( radioButton1->CheckAlign == ContentAlignment::MiddleLeft
 )
      {
         radioButton1->CheckAlign = ContentAlignment::MiddleRight;
      }
      else
      {
         radioButton1->CheckAlign = ContentAlignment::MiddleLeft;
      }
   }

private void radioButton1_CheckedChanged(Object
 sender, EventArgs e)
{
    // Change the check box position to be opposite its current position.
    if (radioButton1.get_CheckAlign().Equals(ContentAlignment.MiddleLeft))
 {
        radioButton1.set_CheckAlign(ContentAlignment.MiddleRight);
    }
    else {
        radioButton1.set_CheckAlign(ContentAlignment.MiddleLeft);
    }
} //radioButton1_CheckedChanged