Constructor Execution see the difference

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestConstructorSeq
{
class Program
{
public class A
{
public A()
{
Console.WriteLine("I am A");
}
static A()
{
Console.WriteLine("I am static A");
}

}
public class B:A
{
public B()
{
Console.WriteLine("I am B");
}
static B()
{
Console.WriteLine("I am static B");
}

}

static void Main(string[] args)
{
B b = new B(); //This outputs
//I am Static B
Console.ReadLine(); //I am Static A
} //I am A
//I am B
}
}
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But this static constructor execution pattern changes in this 3 level inheritance
=================================================================================
class Program

{
public Program()
{
Console.WriteLine("I am p");

}

static Program()
{
Console.WriteLine("I am sp");

}

class Program1:Program

{
public Program1()
{
Console.WriteLine("I am p1");

}

static Program1()
{
Console.WriteLine("I am sp1");

}


}

class Program2 : Program1
{
public Program2()
{
Console.WriteLine("I am p2");

}

static Program2()

{
Console.WriteLine("I am sp2");

}

}

static void Main(string[] args)
{

Program2 p2 = new Program2();
Console.ReadLine();
}
}
}

//Check out the difference between the two