/// <summary>
/// GetInstance method.
/// </summary>
/// <returns>instance on NoteBookService.</returns>
public static NoteBookService GetInstance()
{
if (instance == null)
{
instance = new NoteBookService();
}
return(instance);
}
/// <summary>Initializes static members of the <see cref="NoteBookService"/> class.</summary>
static NoteBookService()
{
instance = new NoteBookService();
}
