title: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)
body: <p>What am I missing I cant figure it out by the way this is a simple tic tac toe game.</p>
  
  <p>Also how can I incorporate a listbox with a horizontal scrollbar to select the player?</p>
  
  <p>Player1 = (x) Or Player2 = (O)</p>
  
  <p>Thanks in advance!!!</p>
  
  <p>Main Form - xGameForm</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Windows.Forms;
  
  namespace MyGame
  {
      public partial class xGameForm : Form
      {
  
          public Button xGameButton9;
          public Button xGameButton8;
          public Button xGameButton7;
          public Button xGameButton6;
          public Button xGameButton5;
          public Button xGameButton4;
          public Button xGameButton3;
          public Button xGameButton2;
          public Button xGameButton1;
  
  
  
          public Button[] _buttonArray;
          public bool isX;
          public bool isGameOver;
  
          Button tempButton = (Button)sender;
  
          public xGameForm()
  
          {
              InitializeComponent();
          }
  
          public void xGameForm_Load(object sender, EventArgs e)
          {
              _buttonArray = new Button[9] { xGameButton1, xGameButton2, xGameButton3, xGameButton4, xGameButton5, xGameButton6, xGameButton7, xGameButton8, xGameButton9 };
  
              for (int i = 0; i &lt; 9; i++)
  
              this._buttonArray[i].Click += new System.EventHandler(this.ClickHandler);
  
              InitTicTacToe(); 
  
          }
  
          public void InitTicTacToe()
          {
              for (int i = 0; i &lt; 9; i++)
              {
                  _buttonArray[i].Text = "";
                  _buttonArray[i].ForeColor = Color.Black;
                  _buttonArray[i].BackColor = Color.LightGray;
                  _buttonArray[i].Font = new System.Drawing.Font("Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
              }
              this.isX = true;
              this.isGameOver = false;
          }
  
         public void ClickHandler(object sender, System.EventArgs e)
          {
              Button tempButton = (Button)sender;
              if( this.isGameOver )
              {
                  MessageBox.Show("press reset to start a new game!","Game End",MessageBoxButtons.OK);
                  return;         
              }
              if( tempButton.Text != "" ) 
              {
                  return;
              }
              if( isX)    
                  tempButton.Text = "X";
              else
                  tempButton.Text = "O";
              isX = !isX; 
              this.isGameOver = Result1.CheckWinner(_buttonArray );
          }
  
         public void xGameResetButton_Click(object sender, EventArgs e)
          {
              InitTicTacToe();    
          }
  }
      }
  </code></pre>
  
  <p>Class Result1</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  
  namespace MyGame
  {
      public class Result1
      {
  
  
          static private int[,] Winners = new int[,]
                     {
                          {0,1,2},
                          {3,4,5},
                          {6,7,8},
                          {0,3,6},
                          {1,4,7},
                          {2,5,8},
                          {0,4,8},
                          {2,4,6}
                     };
          static public bool CheckWinner(Button[] myControls)
          {
              bool gameOver = false;
              for (int i = 0; i &lt; 8; i++)
              {
                  int a = Winners[i, 0], b = Winners[i, 1], c = Winners[i, 2];
                  Button b1 = myControls[a], b2 = myControls[b], b3 = myControls[c];
                  if (b1.Text == "" || b2.Text == "" || b3.Text == "")
                      continue;
                  if (b1.Text == b2.Text &amp;&amp; b2.Text == b3.Text)
                  {
                      b1.BackColor = b2.BackColor = b3.BackColor = Color.LightCoral;
                      b1.Font = b2.Font = b3.Font = new System.Drawing.Font("Microsoft Sans Serif", 32F, System.Drawing.FontStyle.Italic &amp; System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
                      gameOver = true;
                      MessageBox.Show(b1.Text + " .... Wins the game!", "Game End", MessageBoxButtons.OK);
                      break;
                  }
              }
              return gameOver;
          }
      }
  }
  </code></pre>