WPF: A Most Useful Threading Component

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ThreadingComponent
{
    /// <summary>
    /// Provides a base class for <see cref="ThreadableItemViewModelBase">
    /// ThreadableItemViewModel</see> classes. The reason a base class is needed
    /// is that the <see cref="ThreadableHostControl">ThreadableHostControl</see> 
    /// needs to listen to certain INPC value changes to swap the Adorners in and out. 
    /// Now as inheritors of this class use Generics the <see cref="ThreadableHostControl">
    /// ThreadableHostControl</see> needs a common INPC ancestor that it can listen
    /// to INPC property changes from. This base class enables that behaviour.
    /// </summary>
    public class ThreadableItemViewModelBase : ViewModelBase
    {
        #region Data
        private Boolean isBusy = false;
        private Boolean failed = false;
        private String  errorMessage = String.Empty;
        #endregion

        #region Public Properties
        public bool IsBusy
        {
            get { return isBusy; }
            set 
            {
                isBusy = value;
                NotifyPropertyChanged("IsBusy");
            }
        }

        public bool Failed
        {
            get { return failed; }
            set
            {
                failed = value;
                NotifyPropertyChanged("Failed");
            }
        }

        public String ErrorMessage
        {
            get { return errorMessage; }
            set
            {
                errorMessage = value;
                NotifyPropertyChanged("ErrorMessage");
            }
        }
        #endregion
    }
}