class Dept1
 {
   protected int sal;
   public void eSal()
   {
       sal=5000;
   }
 }
 
 class Dept2:Dept1
 {
   int bonus;
   int ts;
   public Dept2()
   {
      bonus=500;
   }
   public tSal()
   {
     ts= sal + bonus;
     MessageBox.Show(ts.ToString());
   }
 }

 private void button1_click()
 {
   Dept2 obj=new Dept2();
   obj.eSal();
   obj.tSal();
 }