Call a base class constructor from derived class

//Base 
    public class ParentClass
    {
        public ParentClass(string a, int b, double c)
        {
            //your code here
        }
    }

    //Derived
    public class ChildClass : ParentClass
    {
        public ChildClass()
            : base("Madhu", 31, 1000.00)
        {
        }
    }