/// <summary>
/// Raises the <see cref="E:PropertyChanging"/> event.
/// </summary>
/// <param name="e">
/// The <see cref="CancelPropertyNotificationEventArgs"/> instance
/// containing the event data.
/// </param>
protected void OnPropertyChanging(CancelPropertyNotificationEventArgs e)
{
PropertyChangingEventHandler temp = this.PropertyChanging;
if (null != temp)
{
temp(this, e);
}
}
/// <summary>
/// Raises the <see cref="E:PropertyChanging"/> event.
/// </summary>
/// <param name="propertyName">
/// Name of the property that is changing.
/// </param>
/// <param name="oldValue">The old value.</param>
/// <param name="newValue">The new value.</param>
/// <returns><c>true</c> if the change can continue; otherwise <c>false</c>.</returns>
protected Boolean OnPropertyChanging(String propertyName,
Object oldValue, Object newValue)
{
CancelPropertyNotificationEventArgs e = new CancelPropertyNotificationEventArgs(propertyName,
oldValue, newValue);
OnPropertyChanging(e);
return(!e.Cancel);
}