PropertyChanged

public event PropertyChangedEventHandler PropertyChanged;

protected virtual void OnPropertyChanged(string propertyName)
{
    this.VerifyProperty(propertyName);

    PropertyChangedEventHandler handler = this.PropertyChanged;
    if (handler != null)
    {
        handler(this, new PropertyChangedEventArgs(propertyName));
    }
}

[Conditional("DEBUG"), DebuggerStepThrough]
private void VerifyProperty(string propertyName)
{
    Type type = this.GetType();

    // Look for a public property with the specified name.
    PropertyInfo propInfo = type.GetProperty(propertyName);

    // If the property could not be found,
    // alert the developer of the problem.
    Debug.Assert(propInfo != null, string.Format("{0} is not a public property of {1}", propertyName, type.FullName));
}