c#我无法从循环中打印消息

我正在尝试制作一个简单的程序，它接受两个整数：一个数字和一个宽度。我想用这个数字打印一个宽度为这个宽度的三角形。我应该使用double-for-loop吗？如果不能，可以按我的方式进行吗？

class Program
    {
        public static int readInt()
        {
            int result;
            string resultString = Console.ReadLine();
            result = int.Parse(resultString);
            return result;
        }
        static void Main(string[] args)
        {
            int number, width;
            Console.WriteLine("Enter a number: ");
            number = readInt();
            Console.WriteLine("Enter a width: ");
            width = readInt();
            do {
                for (int i = width; i < 0; i--)
                {
                    Console.Write(number);
                    width--;
                    Console.WriteLine();
                }
            } while (width < 0);
            Console.ReadLine();
        }
    }

输出：编号：7宽度：4

7777
777
77
7

int space = 0;
do
{
    // Prints initial spaces
    for(int x = 0; x < space; x++)
        Console.Write("-");
    // Print the number for the current value of width        
    for (int i = 0; i < width; i++)
        Console.Write(number);
    // Print final spaces - 
    // Not really needed 
    for (int x = 0; x < space; x++)
        Console.Write("-");
    // Start the new line
    Console.WriteLine();
    //Decrease width by one space for each end (2)
    width-=2;
    // Increment the spaces to print before and after
    space++;
} while (width > 0);