Working with ObservableCollection<T>

using System.ComponentModel;

namespace ViewableCollectionDemo.ViewModels.ObjectModel
{
    /// <summary>
    /// This class is the base class for all ViewModel classes.
    /// </summary>
    public class ObservableObject : INotifyPropertyChanged
    {
        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        /// <summary>
        /// Helper method to raise the PropertyChanged event.
        /// </summary>
        /// <param name="PropertyName">The name of the property that has been changed, as a string.</param>
        protected void RaisePropertyChanged(string PropertyName)
        {
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
            }
        }

        #endregion
    }
}