This program is compiled and tested on a Visual Studio 2012.

using System;

namespace TechStudyCSharp
{
    class Program
    {
        static void Main(string[] args)
        {          
            double num1;
            double num2;
            double total;

            Console.WriteLine("Enter first number :");
            num1 = Convert.ToDouble( Console.ReadLine());
            Console.WriteLine("Enter second number :");
            num2 = Convert.ToDouble(Console.ReadLine());

            total = num2 * num1;

            Console.WriteLine("\nTotal is : " + total);         
            Console.ReadKey();
        }
    }
}

Result:

Enter first number :

3.5

Enter second number :

4.5

Total is : 15.75