Code

this is what i have done how do i make sure that the total is 10 and when i enter a new contact it takes the space and lets me how much space i have left

You can put the total on top and each time a new car takes a space you can minus the total:

 static void Main(string[] args)
        {
            int Totalspace = 10;
            string name;
            Console.WriteLine("Valvet Parking");

            for (int i = 0; i < 10; i++)
            {
                if (Totalspace > 0)
                {
                    Console.WriteLine("Please enter Name");
                    name = Console.ReadLine();
                    Console.WriteLine("{0} has been stored", name);
                    Console.WriteLine("Enter the License plate Number");
                    LicenseplateNumber = Console.ReadLine();
                    Totalspace -= 1;
                    Console.WriteLine("");
                    Console.WriteLine("{0} space is left", Totalspace);
                    Console.WriteLine("");
                    Console.WriteLine("No more car enter ? Y/N");
                    string stop = Console.ReadLine();
                    if (stop.ToUpper() == "N")
                    {                    
                        Console.WriteLine("There is {0} space left", Totalspace);
                        break;
                    }
                }
            }
        }
        public static string LicenseplateNumber { get; set; }