Singleton C#

Non thread-safe

public class MyStorage
{
    private static MyStorage instance;

    public static MyStorage Instance
    {
        get {
            if (instance == null)
                instance = new MyStorage();

            return instance;
        }
    }

    private MyStorage()
    {
        // do stuff
        InitStuff();

        bool result;
        _overwrite = bool.TryParse( ConfigurationManager.AppSettings["Overwrite"], out result) ? result : false;
    }

    ...    
}