Multiplication in C#

Question

I'm new to C# and tried the following program on multiplication using Switch. The program is perfectly going thru the Switch cases, but the multiplied result is not displaying in the console. Can you please help:

using System;

public class Program
{
 public static void Main(string[] args)
 {
    int _pLicense = 50;
    int _sLicense = 100;
    int _eLicense = 150;
    String lType;
    int nSeats;
Console.WriteLine("\n1.Personal License\n2.Startup License\n3.Enterprise License");
        Console.WriteLine("Enter the license type");
        lType = Console.ReadLine();
        //lType = char.Parse(Console.ReadLine());


switch(lType)
    {
        case "1":
            Console.WriteLine("Enter the number of seats");
            nSeats = int.Parse(Console.ReadLine());
            //Console.WriteLine(_pLicense);
            int Cost = _pLicense*nSeats;
            Console.WriteLine("Personal License Cost : $", +Cost);
            break;
        case "2":
            Console.WriteLine("Enter the number of seats");
            nSeats = int.Parse(Console.ReadLine());
            //Console.WriteLine(_sLicense);
            Cost = (_sLicense * nSeats);
            Console.WriteLine("Startup License Cost : $", Cost);
            break;
        case "3":
            Console.WriteLine("Enter the number of seats");
            nSeats = int.Parse(Console.ReadLine());
            //Console.WriteLine(_pLicense);
            Cost = (_eLicense * nSeats);
            Console.WriteLine("Enterprise License Cost : $", Cost);
            break;
        default:
        Console.WriteLine("Invalid Type");
           break;
    }
}

}

Answer 1

You are missing formaterlike {0}

 Console.WriteLine("Enterprise License Cost : ${0}", Cost);