/// <summary>
/// Initializes a new instance of the <see cref="NotificationMessageWithCallback" /> class.
/// </summary>
/// <param name="sender">The message's sender.</param>
/// <param name="notification">An arbitrary string that will be carried by the message.</param>
/// <param name="callback">The callback method that can be executed by the recipient to notify the sender that the message has been processed.</param>
public NotificationMessageWithCallback(Object sender, String notification, Delegate callback) : base(sender, notification)
{
NotificationMessageWithCallback.CheckCallback(callback);
this.callback = callback;
}
/// <summary>
/// Initializes a new instance of the <see cref="NotificationMessageWithCallback" /> class.
/// </summary>
/// <param name="notification">An arbitrary string that will be carried by the message.</param>
/// <param name="callback">The callback method that can be executed by the recipient to notify the sender that the message has been processed.</param>
public NotificationMessageWithCallback(string notification, Delegate callback) : base(notification)
{
NotificationMessageWithCallback.CheckCallback(callback);
this.callback = callback;
}