/// <summary>
/// Provides the ability to add an error as a Notification message with an optional error code.
/// </summary>
public static NotificationCollection AddError(this NotificationCollection instance, string error, string errorCode)
{
var notification = new Notification(error, NotificationSeverity.Error);
if (errorCode.IsNotNullOrEmpty())
{
notification.Code = errorCode;
}
instance.AddMessage(notification);
return(instance);
}