CheckBox CheckChanged event

Question

After Checkbox.IsChecked = true, the Checked event is fired. After Checkbox.IsChecked = false, the UnChecked event is fired. But what event is fired after IsChecked = null?

Answer 1

The check box will show an indeterminate state when IsChecked is set to null. Look at this link for more details. You can write code in indeterminate state like this:

<CheckBox Checked="CheckBox_Checked"
 Unchecked="CheckBox_Unchecked"
 Indeterminate="CheckBox_Indeterminate"
 IsThreeState="True"/>

And in the code behind:

private void CheckBox_Indeterminate(object sender, RoutedEventArgs e)
{
  //write some code in Indeterminate states
}

Indeterminate is an event that occurs when the state of a CheckBox is switched to the indeterminate state. You can check this link about Indeterminate Event.