静的メソッドでインスタンスメソッドを呼び出す自作自販

public class SomeClass
{
    private string myfield = null;
    public static SomeClass instance = new SomeClass();
    public instranceMethod() {};
    public static staticMethod() {};
}
 
public class AnotherClass
{
    public static Main()
    {
        // ,  ， 
      SomeClass someClass = new SomeClass();
         someClass.instanceMethod();
 
        // ， ， 
      SomeClass.instance.instanceMethod();
 
        // ， 
      SomeClass.staticMethod();
    }
}