UIElement

using System;

namespace CSLight
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int healthPercent = 0;
            int manaPercent = 0;
            int maxValue = 10;
            int maxPercent = 100;

            while (maxPercent >= healthPercent && maxPercent >= manaPercent)
            {
                DrawnBar(maxValue, healthPercent, 0);
                DrawnBar(maxValue, manaPercent, 2);

                Console.SetCursorPosition(0, 4);

                Console.WriteLine("Введите желаемый процент(%) жизни (от 0 до 100): ");
                healthPercent = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Введите желаемый процент(%) маны (от 0 до 100): ");
                manaPercent = Convert.ToInt32(Console.ReadLine());

                Console.ReadKey();
                Console.Clear();
            }
        }

        static void DrawnBar(int maxValue, int percent, int position)
        {
            string tempBar;

            char openSymbol = '[';
            char closeSymbol = ']';
            char percentSymbol = '#';
            char excessSymbol = '_';

            int percentLength = percent / maxValue; ;
            int excessLength = maxValue - percentLength;

            Console.SetCursorPosition(0, position);

            tempBar = FillLine(percentLength, symbol: percentSymbol);
            Console.Write(openSymbol + tempBar);

            tempBar = FillLine(excessLength, symbol: excessSymbol);
            Console.Write(tempBar + closeSymbol);
        }

        static string FillLine(int value, char symbol)
        {
            string bar = "";

            for (int i = 0; i < value; i++)
            {
                bar += symbol;
            }

            return bar;
        }
    }
}