Question

This is a singleton class

public sealed class Singleton
{
    static Singleton instance=null;
    static readonly object padlock = new object();

    Singleton()
    {
    }

    public static Singleton Instance
    {
        get
        {
            lock (padlock)
            {
                if (instance==null)
                {
                    instance = new Singleton();
                }
                return instance;
            }
        }
    }
}

my question is static Singleton instance=null; why this is static?

Answer 1

The ‘instance’ field holds the reference of the one and only instance.

It is stored in a static variable because its scope has to be the class itself and not a particular instance.