public class Example
{
    public class TestStatic
    {
        public static int TestValue;
        public TestStatic()
        {
            if (TestValue == 0)
            {
                TestValue = 10; 
            }
            else
            {
                TestValue += 5;           
	  }
	}
         public void Print()
        {
            Console.WriteLine("TestValue : " + TestValue);
        }
    }
   public static void Main()
    {
        TestStatic t = new TestStatic();
        t.Print();  
        TestStatic t1 = new TestStatic();
        t1.Print(); 
        TestStatic t2 = new TestStatic();
        t2.Print(); 
    }