How to call base class constructor in derived class

Below is the code with result. Use base keyword to access base class parameterised construtor in derived class


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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
         
            DerivedClass dobj = new DerivedClass();
            DerivedClass dobj1 = new DerivedClass("Pravin");
            Console.ReadLine();
        }
    }
    class BaseClass
    {
       public BaseClass()
        {
            Console.WriteLine("I am base class constructor");
        }
        public BaseClass(string para)
        {
            Console.WriteLine("I am base class constructor with parameter value - " + para);
        }
    }
     class DerivedClass: BaseClass
    {
       public DerivedClass()
        {
            Console.WriteLine("I am derived class constructor");
        }
        public DerivedClass(string para): base(para)
        {
            Console.WriteLine("I am derived class constructor with parameter value - " + para);
        }
    }
}