Bingo with C#

using System;
using System.Threading.Tasks;

namespace Bingo
{
    public static class global
    {
        public static string Mode;
        public static int i, j;
        public static int[,] COM_Board= new int [6,6];
        public static int[,] Human_Board = new int[6,6];
    }

    class Program
    {
        public static void PrintHumanBoard()
        {
            for (int i=1;i<=5;i++)
            {
                for (int j = 1; j <= 5; j++)
                    if (global.Human_Board[i, j] == 0)
                    {
                        Console.ForegroundColor = ConsoleColor.Yellow;
                        if (global.Human_Board[i, j] < 10)
                            Console.Write("{0}  ", global.Human_Board[i, j]);
                        else Console.Write("{0} ", global.Human_Board[i, j]);
                        Console.ForegroundColor = ConsoleColor.White;
                    }
                    else
                    {
                        if (global.Human_Board[i, j] < 10)
                            Console.Write("{0}  ", global.Human_Board[i, j]);
                        else Console.Write("{0} ", global.Human_Board[i, j]);
                    }
                Console.WriteLine();
            }
        }
        public static void PrintCOMBoard()
        {
            for (int i = 1; i <= 5; i++)
            {
                for (int j = 1; j <= 5; j++)
                    if (global.COM_Board[i, j] == 0)
                    {
                        Console.ForegroundColor = ConsoleColor.Yellow;
                        if (global.COM_Board[i, j] < 10)
                            Console.Write("{0}  ", global.COM_Board[i, j]);
                        else Console.Write("{0} ", global.COM_Board[i, j]);
                        Console.ForegroundColor = ConsoleColor.White;
                    }
                    else
                    {
                        if (global.COM_Board[i, j] < 10)
                            Console.Write("{0}  ", global.COM_Board[i, j]);
                        else Console.Write("{0} ", global.COM_Board[i, j]);
                    }
                Console.WriteLine();
            }
        }
        public static void Sout(string S)
        {
            Console.WriteLine(S);
            Task.Delay(1000);
        }
        public static void Info()
        {
            Sout("Made by Tran Viet Anh");
            Sout("Do not copy");
        }
        public static void Init_Board()
        {
            Console.Write("Choose mode: ");
            global.Mode = Console.ReadLine();
            global.Mode = global.Mode.ToUpper();
            while ((global.Mode!="EASY") && (global.Mode!="NORMAL"))
            {
                Console.Write("Mode inputed is invalid, please input again: ");
                global.Mode = Console.ReadLine();
                global.Mode = global.Mode.ToUpper();
            }
            Console.Write("Make board by manual or auto? ");
            string Choice = Console.ReadLine();
            Choice = Choice.ToUpper();
            while (Choice=="INFO")
            {
                Info();
                Console.Write("Input command again: ");
                Choice = Console.ReadLine();
                Choice = Choice.ToUpper();
            }
            while ((Choice!="AUTO") && (Choice!="MANUAL"))
            {
                Console.Write("Command inputed is invalid, please input again: ");
                Choice = Console.ReadLine();
                Choice = Choice.ToUpper();
            }
            if (Choice=="AUTO")
            {
                int value = 0;
                for (int i=1;i<=5;i++)
                    for (int j=1;j<=5;j++)
                    {
                        value++;
                        global.Human_Board[i, j] = value;
                    }
                Random Rnd = new Random();
                for (int i=1;i<=5;i++)
                    for (int j=1;j<=5;j++)
                    {
                        int x = Rnd.Next(5) + 1;
                        int y = Rnd.Next(5) + 1;
                        //Swap
                        int Mid = global.Human_Board[i, j];
                        global.Human_Board[i, j] = global.Human_Board[x, y];
                        global.Human_Board[x, y] = Mid;
                    }
                value = 0;
                for (int i = 1; i <= 5; i++)
                    for (int j = 1; j <= 5; j++)
                    {
                        value++;
                        global.COM_Board[i, j] = value;
                    }
                for (int i = 1; i <= 5; i++)
                    for (int j = 1; j <= 5; j++)
                    {
                        int x = Rnd.Next(5) + 1;
                        int y = Rnd.Next(5) + 1;
                        //Swap
                        int Mid = global.COM_Board[i, j];
                        global.COM_Board[i, j] = global.COM_Board[x, y];
                        global.COM_Board[x, y] = Mid;
                    }
                PrintHumanBoard();
                PrintCOMBoard();
            }
        }
        public static void Tie()
        {
            Console.Clear();
            PrintHumanBoard();
            Console.WriteLine();
            PrintCOMBoard();
            Console.Write("TIE");
            Console.ReadLine();
        }
        public static void ComputerWon()
        {
            Console.Clear();
            PrintHumanBoard();
            Console.WriteLine();
            PrintCOMBoard();
            Console.WriteLine("COM WON!");
            Console.ReadLine();
        }
        public static void HumanWon()
        {
            Console.Clear();
            PrintHumanBoard();
            Console.WriteLine();
            PrintCOMBoard();
            Console.WriteLine("HUMAN WON!");
            Console.ReadLine();
        }
        public static int HumanDiagonalScore()
        {
            int count = 0, c = 0;
            for (int i = 1; i <= 5; i++)
                if (global.COM_Board[i, i] == 0) c++;
            if (c == 5) count++;
            for (int i = 1; i <= 5; i++)
                if (global.COM_Board[i, 5 - i + 1] == 0) c++;
            if (c == 5) count++;
            return count;
        }
        public static int HumanLineScore()
        {
            int Score=0;
            for (int i=1;i<=5;i++)
            {
                int LineScore = 0;
                for (int j = 1; j <= 5; j++)
                    if (global.Human_Board[i, j] == 0) LineScore++;
                if (LineScore == 5) Score++;
            }
            return Score;
        }
        public static int HumanColumnScore()
        {
            int Score = 0;
            for (int i = 1; i <= 5; i++)
            {
                int LineScore = 0;
                for (int j = 1; j <= 5; j++)
                    if (global.Human_Board[i, j] == 0) LineScore++;
                if (LineScore == 5) Score++;
            }
            return Score;
        }
        public static int COMDiagonalScore()
        {
            int count = 0, c = 0;
            for (int i = 1; i <= 5; i++)
                if (global.COM_Board[i, i] == 0) c++;
            if (c == 5) count++;
            for (int i = 1; i <= 5; i++)
                if (global.COM_Board[i, 5-i+1] == 0) c++;
            if (c == 5) count++;
            return count;
        }
        public static int COMColumnScore()
        {
            int Count = 0;
            for (int j = 1; j <= 5; j++)
            {
                int c = 0;
                for (int i = 1; i <= 5; i++)
                    if (global.COM_Board[i, j] == 0) c++;
                if (c == 5) Count++;
            }
            return Count;
        }
        public static int COMLineScore()
        {
            int Count = 0;
            for (int i = 1; i <= 5; i++)
            {
                int c = 0;
                for (int j = 1; j <= 5; j++)
                    if (global.COM_Board[i, j] == 0) c++;
                if (c == 5) Count++;
            }
            return Count;
        }
        public static bool COMVictoryCondition()
        {
            int Score = 0;
            Score = Score + COMLineScore();
            Score = Score + COMColumnScore();
            Score = Score + COMDiagonalScore();
            if (Score >= 5) return true;
            else return false;
        }
        public static bool HumanVictoryCondition()
        {
            int Score = 0;
            Score = Score + HumanLineScore();
            Score = Score + HumanColumnScore();
            Score = Score + HumanDiagonalScore();
            if (Score >= 5) return true;
            else return false;
        }
        public static bool ValidChoice(int Choice)
        {
            if ((Choice < 1) || (Choice > 25)) return false;
            else
            {
                bool B = false;
                for (int i=1;i<=5;i++)
                    for (int j=1;j<=5;j++)
                        if (global.Human_Board[i,j]==Choice)
                        {
                            B = true;
                            break;
                        }
                return B;
            }
        }
        public static bool ValidCOMChoice(int Value)
        {
            bool B = false;
            for (int i=1;i<=5;i++)
                for (int j=1;j<=5;j++)
                    if (global.COM_Board[i,j]==Value)
                    {
                        B = true;
                        break;
                    }
            return B;
        }
        public static int EasyBot()
        {
            int COMChoice;
            Random Rnd = new Random();
            COMChoice = Rnd.Next(25) + 1;
            while (!ValidCOMChoice(COMChoice))
                COMChoice = Rnd.Next(25) + 1;
            return COMChoice;
        }
        public static void Play()
        {
            int Choice = 0;
            while (!(HumanVictoryCondition()) && !(COMVictoryCondition()))
            {
                Console.Clear();
                PrintHumanBoard();
                Console.WriteLine();
                Console.Write("Input Choice: ");
                Choice = int.Parse(Console.ReadLine());
                while (!(ValidChoice(Choice)))
                {
                    Console.WriteLine("Invalid value, input again: ");
                    Choice = int.Parse(Console.ReadLine());
                }
                for (int i = 1; i <= 5; i++)
                    for (int j = 1; j <= 5; j++)
                        if (global.Human_Board[i, j] == Choice) global.Human_Board[i, j] = 0;
                for (int i = 1; i <= 5; i++)
                    for (int j = 1; j <= 5; j++)
                        if (global.COM_Board[i, j] == Choice) global.COM_Board[i, j] = 0;
                if ((HumanVictoryCondition()) == (COMVictoryCondition()))
                {
                    if (HumanVictoryCondition() == true)
                        Tie();
                }
                else
                    if (HumanVictoryCondition() == true)
                        HumanWon();
                    else ComputerWon();
                if (global.Mode == "EASY") Choice = EasyBot();
                Console.Write("COM Choice: ");
                System.Threading.Thread.Sleep(1000);
                Console.WriteLine(Choice);
                System.Threading.Thread.Sleep(1000);
                for (int i = 1; i <= 5; i++)
                    for (int j = 1; j <= 5; j++)
                        if (global.Human_Board[i, j] == Choice) global.Human_Board[i, j] = 0;
                for (int i = 1; i <= 5; i++)
                    for (int j = 1; j <= 5; j++)
                        if (global.COM_Board[i, j] == Choice) global.COM_Board[i, j] = 0;
                if ((HumanVictoryCondition()) == (COMVictoryCondition()))
                {
                    if (HumanVictoryCondition() == true)
                        Tie();
                }
                else
                    if (HumanVictoryCondition() == true)
                    HumanWon();
                else ComputerWon();
            }
        }
        static void Main(string[] args)
        {
            Console.Clear();
            Console.ForegroundColor = ConsoleColor.White;
            Init_Board();
            Play();
        }
    }
}