Console Closes on Enter Press C#

Console Closes on Enter Press C#

I am having trouble with my console application(C#). I want to make it so
when you input a car brand it will return the total value off all those
cars i have done that successfully. What i am having trouble with is that
i want them to be able to input another car brand and the program return
the total amount again without it closing. Right now it closes the second
time someone hits enter. Please help! My code below.
namespace Cars
{
class Program
{
static void Main(string[] args)
{
List<Car> myCars = new List<Car>() {
new Car() { Make="BMW", Model="550i", Color=CarColor.Blue,
StickerPrice=55000, Year=2009 },
new Car() { Make="Toyota", Model="4Runner",
Color=CarColor.White, StickerPrice=35000, Year=2010 },
new Car() { Make="BMW", Model="745li", Color=CarColor.Black,
StickerPrice=75000, Year=2008 },
new Car() { Make="Ford", Model="Escape", Color=CarColor.White,
StickerPrice=28000, Year=2008 },
new Car() { Make="BMW", Model="550i", Color=CarColor.Black,
StickerPrice=57000, Year=2010 }
};
Console.WriteLine("Type \"all\" to see total value of all cars");
Console.WriteLine("Type \"bmw\" to see total value of all bmws");
Console.WriteLine("Type \"toyota\" to see total value of all
Toyotas");
Console.WriteLine("Type \"ford\" to see total value of all Fords");
string userValue = Console.ReadLine();
if (userValue == "all")
{
var _orderedCars = myCars.OrderByDescending(p => p.Year);
foreach (var car in _orderedCars)
{
Console.WriteLine("{0} {1} - {2} - {3:C}", car.Make,
car.Model, car.Year, car.StickerPrice);
}
var sum = _orderedCars.Sum(p => p.StickerPrice);
Console.WriteLine("{0:C}", sum);
Console.ReadLine();
}
else if (userValue == "bmw")
{
var _bmws = myCars.Where(car => car.Make == "BMW");
foreach (var car in _bmws)
{
Console.WriteLine("{0} {1} - {2}- {3:C}", car.Make,
car.Model, car.Year, car.StickerPrice);
}
var sum = _bmws.Sum(p => p.StickerPrice);
Console.WriteLine("{0:C}", sum);
Console.ReadLine();
}
else if (userValue == "toyota")
{
var _toyotaCars = myCars.Where(car => car.Make == "Toyota");
foreach (var car in _toyotaCars)
{
Console.WriteLine("{0} {1} - {2} - {3:C}", car.Make,
car.Model, car.Year, car.StickerPrice);
}
var sum = _toyotaCars.Sum(p => p.StickerPrice);
Console.WriteLine("{0:C}", sum);
Console.ReadLine();
}
else if (userValue == "ford")
{
var _fordCars = myCars.Where(car => car.Make == "Ford");
foreach (var car in _fordCars)
{
Console.WriteLine("{0} {1} - {2} - {3:C}", car.Make,
car.Model, car.Year, car.StickerPrice);
}
var sum = _fordCars.Sum(p => p.StickerPrice);
Console.WriteLine("{0:C}", sum);
Console.ReadLine();
}
else
{
Console.WriteLine("Error");
}
}
class Car
{
public string Make { get; set; }
public string Model { get; set; }
public int Year { get; set; }
public double StickerPrice { get; set; }
public CarColor Color { get; set; }
}
enum CarColor
{
White,
Black,
Red,
Blue,
Yellow
}
}
}