Game Rules

Traditionally the first player plays with "X". So you can decide who wants to go "X" and who wants go with "O".
Only one player can play at a time.
If any of the players have filled a square then the other player and the same player cannot override that square.
There are only two conditions that may be match will be draw or may be win.
The player that succeeds in placing three respective mark (X or O) in a horizontal, vertical or diagonal row wins the game.
Winning condition

Whoever places three respective marks (X or O) horizontally vertically or diagonally will be the winner.

The code for the game is as follows:

using System;
using System.Threading;

namespace TIC_TAC_TOE
{
    class Program
    {
        //making array and
        //by default I am providing 0-9 where no use of zero
        static char[] arr = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
        static int player = 1; //By default player 1 is set
        static int choice; //This holds the choice at which position user want to mark

        // The flag veriable checks who has won if it's value is 1 then some one has won the match if -1 then Match has Draw if 0 then match is still running
        static int flag = 0;

        static void Main(string[] args)
        {
            do
            {
                Console.Clear();// whenever loop will be again start then screen will be clear
                Console.WriteLine("Player1:X and Player2:O");
                Console.WriteLine("\n");
                if (player % 2 == 0)//checking the chance of the player
                {
                    Console.WriteLine("Player 2 Chance");
                }
                else
                {
                    Console.WriteLine("Player 1 Chance");
                }
                Console.WriteLine("\n");
                Board();// calling the board Function
                choice = int.Parse(Console.ReadLine());//Taking users choice

                // checking that position where user want to run is marked (with X or O) or not
                if (arr[choice] != 'X' && arr[choice] != 'O')
                {
                    if (player % 2 == 0) //if chance is of player 2 then mark O else mark X
                    {
                        arr[choice] = 'O';
                        player++;
                    }
                    else
                    {
                        arr[choice] = 'X';
                        player++;
                    }
                }
                else //If there is any possition where user want to run and that is already marked then show message and load board again
                {
                    Console.WriteLine("Sorry the row {0} is already marked with {1}", choice, arr[choice]);
                    Console.WriteLine("\n");
                    Console.WriteLine("Please wait 2 second board is loading again.....");
                    Thread.Sleep(2000);
                }
                flag = CheckWin();// calling of check win
            } while (flag != 1 && flag != -1);// This loof will be run until all cell of the grid is not marked with X and O or some player is not win

            Console.Clear();// clearing the console
            Board();// getting filled board again

            if (flag == 1)// if flag value is 1 then some one has win or means who played marked last time which has win
            {
                Console.WriteLine("Player {0} has won", (player % 2) + 1);
            }
            else// if flag value is -1 the match will be draw and no one is winner
            {
                Console.WriteLine("Draw");
            }
            Console.ReadLine();
        }
        // Board method which creats board
        private static void Board()
        {
            Console.WriteLine("     |     |      ");
            Console.WriteLine("  {0}  |  {1}  |  {2}", arr[1], arr[2], arr[3]);
            Console.WriteLine("_____|_____|_____ ");
            Console.WriteLine("     |     |      ");
            Console.WriteLine("  {0}  |  {1}  |  {2}", arr[4], arr[5], arr[6]);
            Console.WriteLine("_____|_____|_____ ");
            Console.WriteLine("     |     |      ");
            Console.WriteLine("  {0}  |  {1}  |  {2}", arr[7], arr[8], arr[9]);
            Console.WriteLine("     |     |      ");
        }

        //Checking that any player has won or not
        private static int CheckWin()
        {
            #region Horzontal Winning Condtion
            //Winning Condition For First Row
            if (arr[1] == arr[2] && arr[2] == arr[3])
            {
                return 1;
            }
            //Winning Condition For Second Row
            else if (arr[4] == arr[5] && arr[5] == arr[6])
            {
                return 1;
            }
            //Winning Condition For Third Row
            else if (arr[6] == arr[7] && arr[7] == arr[8])
            {
                return 1;
            }
            #endregion

            #region vertical Winning Condtion
            //Winning Condition For First Column
            else if (arr[1] == arr[4] && arr[4] == arr[7])
            {
                return 1;
            }
            //Winning Condition For Second Column
            else if (arr[2] == arr[5] && arr[5] == arr[8])
            {
                return 1;
            }
            //Winning Condition For Third Column
            else if (arr[3] == arr[6] && arr[6] == arr[9])
            {
                return 1;
            }
            #endregion

            #region Diagonal Winning Condition
            else if (arr[1] == arr[5] && arr[5] == arr[9])
            {
                return 1;
            }
            else if (arr[3] == arr[5] && arr[5] == arr[7])
            {
                return 1;
            }
            #endregion

            #region Checking For Draw
            // If all the cells or values filled with X or O then any player has won the match
            else if (arr[1] != '1' && arr[2] != '2' && arr[3] != '3' && arr[4] != '4' && arr[5] != '5' && arr[6] != '6' && arr[7] != '7' && arr[8] != '8' && arr[9] != '9')
            {
                return -1;
            }
            #endregion

            else
            {
                return 0;
            }
        }
    }
}