using System; 
  
 namespace TicTacToe 
 { 
     class Program 
     { 
     static char[] board = { '1', '2', '3', '4', '5', '6', '7', '8', '9' }; 
     static int player = 1; // Player 1 starts 
     static int choice; 
     static int flag = 0; // Flag to check the win 
      
     static void Main(string[] args) 
     { 
     do 
     { 
     Console.Clear(); // Whenever loop will start, screen will be clear 
     Console.WriteLine("Player 1: X and Player 2: O"); 
     Console.WriteLine("\n"); 
     if (player % 2 == 0) 
     { 
     Console.WriteLine("Turn Player 2"); 
     } 
     else 
     { 
     Console.WriteLine("Turn Player 1"); 
     } 
     Console.WriteLine("\n"); 
     Board(); 
     choice = int.Parse(Console.ReadLine()); // Taking users input 
     if (board[choice - 1] != 'X' && board[choice - 1] != 'O') 
     { 
     if (player % 2 == 0) //Checking the chance of the player 
     { 
     board[choice - 1] = 'O'; 
     player++; 
     } 
     else 
     { 
     board[choice - 1] = 'X'; 
     player++; 
     } 
     } 
     else // If there is any problem in user input 
     { 
     Console.WriteLine("Sorry the row {0} is already marked with an {1}", choice, board[choice - 1]); 
     Console.WriteLine("\n"); 
     Console.WriteLine("Please wait 2 second board is loading again..."); 
     System.Threading.Thread.Sleep(2000); 
     } 
     flag = CheckWin(); // calling of checkwin 
     } while (flag != 1 && flag != -1); 
     Console.Clear(); 
     Board(); 
     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(); 
     } 
      
     private static void Board() 
     { 
     Console.WriteLine("    |    |    "); 
     Console.WriteLine("  {0}  |  {1}  |  {2}", board[0], board[1], board[2]); 
     Console.WriteLine("____|____|____ "); 
     Console.WriteLine("    |    |    "); 
     Console.WriteLine("  {0}  |  {1}  |  {2}", board[3], board[4], board[5]); 
     Console.WriteLine("____|____|____ "); 
     Console.WriteLine("    |    |    "); 
     Console.WriteLine("  {0}  |  {1}  |  {2}", board[6], board[7], board[8]); 
     Console.WriteLine("    |    |    "); 
     } 
      
     private static int CheckWin() // Checking that any player has won or not 
     { 
     #region Horzontal Winning Condtion 
     // Winning Condition For First Row 
     if (board[0] == board[1] && board[1] == board[2]) 
     { 
     return 1; 
     } 
     // Winning Condition For Second Row 
     else if (board[3] == board[4] && board[4] == board[5]) 
     { 
     return 1; 
     } 
     // Winning Condition For Third Row 
     else if (board[6] == board[7] && board[7] == board[8]) 
     { 
     return 1; 
     } 
     #endregion 
      
     #region Vertical Winning Condtion 
     // Winning Condition For First Column 
     else if (board[0] == board[3] && board[3] == board[6]) 
     { 
     return 1; 
     } 
     // Winning Condition For Second Column 
     else if (board[1] == board[4] && board[4] == board[7]) 
     { 
     return 1; 
     } 
     // Winning Condition For Third Column 
     else if (board[2] == board[5] && board[5] == board[8]) 
     { 
     return 1; 
     } 
     #endregion 
      
     #region Diagonal Winning Condition 
     else if (board[0] == board[4] && board[4] == board[8]) 
     { 
     return 1; 
     } 
     else if (board[2] == board[4] && board[4] == board[6]) 
     { 
     return 1; 
     } 
     #endregion 
      
     #region Checking For Draw 
     // If all the cells or values in the array not equals to X and O 
     else if (board[0] != '1' && board[1] != '2' && board[2] != '3' && board[3] != '4' && board[4] != '5' && board[5] != '6' && board[6] != '7' && board[7] != '8' && board[8] != '9') 
     { 
     return -1; 
     } 
     #endregion 
      
     else 
     { 
     return 0; 
     } 
     } 
     } 
 }