RadioButton.OnCheckedChanged Method (EventArgs)

 

Raises the CheckedChanged event.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

protected virtual void OnCheckedChanged(
	EventArgs e
)

Parameters

e
Type: System.EventArgs

An EventArgs that contains the event data.

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

The OnCheckedChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors:

When overriding OnCheckedChanged in a derived class, be sure to call the base class’s OnCheckedChanged method so that registered delegates receive the event.

The following code example demonstrates how the CheckAlign property can be changed at run time. The check box portion of a RadioButton is moved to the right or left of the text when the Checked value changes. This example requires that a RadioButton control has been instantiated on a form and that a reference to the System.Drawing namespace has been included.

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

.NET Framework
Available since 1.1
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