Simple Singleton Template for C#

Singleton.cs

// Singleton
//
// declaration:
// public class A
// {
//     public static A Instance { get { return Singleton<A>.Instance; } }
//     public void foo(){}
// }
//
// usage:
// A.Instance.foo();
public class Singleton<T> where T : new()
{
    static T instance;
    public static T Instance
    {
        get
        {
            if (instance == null)
                instance = new T();

            return instance;
        }
    }
}