System.ComponentModel.Design.ComponentChangedEventArgs
namespace System.ComponentModel.Design
{
public sealed class ComponentChangedEventArgs : EventArgs
{
public object Component { get; }
public MemberDescriptor Member { get; }
public object NewValue { get; }
public object OldValue { get; }
public ComponentChangedEventArgs(object component, MemberDescriptor member, object oldValue, object newValue);
}
}