Constructors in C#.

C# creates default constructor for all classes. We do not need to create a constructor explicitly. There will be a default constructor.

namespace OopConcept
{
    /// 

    /// Class without explicit contructor 
    /// 
    class mainClass
    {
        private int m_int;

        static void Main(string[] args)
        {
            //*******>No error*******
            mainClass myMainClass = new mainClass(); 
        }
    }
}

But when we create a parametrized constructor the default constructor will be removed..

class mainClass
    {
        private int m_int;

        /// 

        /// Parametrized contructor created by the user.
        /// 
        ///         

        public mainClass(int num)
        {
            this.m_int = num;
        }
        static void Main(string[] args)
        {
            //*******ERROR********
            mainClass myMainClass = new mainClass();
        }
    }