Whats wrong with my code?

Question

using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;

namespace CSharp_Shell
{

public static class Program
{
public static void Main(string[]args)
{
Console.WriteLine("Enter your age");
int a;

a= Console.ReadLine();
if(a<18){
Console.WriteLine("Not permitted");

}}

}
}

Answer 1

You need to convert Console.ReadLine() to int with Int32.Parse(). Becomes Int32.Parse(Console.ReadLine())

Answer 2

Why to convert?

Answer 3

It worked. Thanks.

Answer 4

It also wirks by this method...

a= int.Parse(Console.ReadLine());