public class SomeClass{    private string myfield = null;    public static SomeClass instance = new SomeClass();    public instranceMethod() {};    public static staticMethod() {};} public class AnotherClass{    public static Main()    {        //第一种方式, 声明实例，调用实例方法      SomeClass someClass = new SomeClass();         someClass.instanceMethod();         //第二种方式，通过一个静态的实例，去调用实例方法      SomeClass.instance.instanceMethod();         //第三种方式，直接调用静态方法      SomeClass.staticMethod();    }}