如何防止.NET运行时中的静态变量共享？

public sealed class Singleton
{
    private static readonly Singleton instance = new Singleton();

    private Singleton()
    {
    }

    public static Singleton Instance
    {
        get
        {
            return instance;
        }
    }
}

public static class StaticClass
{
    static StaticClass()
    {
        // 初始化静态变量
    }
}

private static ConcurrentDictionary<int, object> threadData = new ConcurrentDictionary<int, object>();

private static ThreadLocal<object> threadData = new ThreadLocal<object>(() => new object());

private static object lockObject = new object();

private static void Method()
{
    lock (lockObject)
    {
        // 访问静态变量
    }
}