gistfile1.txt

namespace virgol
{
    class Program
    {
        static void Main()
        {
            UserMsg.sayGoodMorning();
        }
    }
}
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create new class 
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namespace virgol
{
    public class UserMsg
    {
        public static void sayGoodMorning()
        {
            Console.WriteLine("good morning");
        }
    }
}