ДЗ: UIElement

using System;

namespace Bar
{
    class Program
    {
        const int WidthBar = 10;
        const int Percents = 100;

        static void Main(string[] args)
        {
            ShowBar(50, ConsoleColor.Red, 5, 2);
            ShowBar(20, ConsoleColor.Cyan, 5, 3);
        }

        static void ShowBar(int percent, ConsoleColor fillingColor, int positionX, int positionY)
        {
            int fullSegments = percent * WidthBar / Percents;
            ConsoleColor defaultColor = Console.BackgroundColor;
            Console.SetCursorPosition(positionX, positionY);
            Console.Write("[");
            Console.BackgroundColor = fillingColor;
            PrintLine(fullSegments, '#');
            Console.BackgroundColor = defaultColor;
            PrintLine(WidthBar - fullSegments, ' ');
            Console.WriteLine("]");
        }

        static void PrintLine(int length, char filler)
        {
            for (int i = 0; i < length; i++)
                Console.Write(filler);
        }
    }
}