Button array to text file?

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C#

I'm confused on how to get the button.text information, for instance if the button.text is 1 2 or 3. I'm lost here no matter what I try because I want to write each button's text in the buttonArray to a file.I think the issue may be I have the wrong code to do this in the saving part. A blank file is always created so I know it is wrong. How would I change my code to write the buttonArray to a text file? Any help is great

private int _col;
      public int Columns
      {
          get
          {
              return _col;
          }
          set
          {
              _col = value;
          }

      }
      private int _row;
      public int Rows
      {
          get
          {
              return _row;
          }
          set
          {
              _row = value;
          }
      }


      MapProperties mapProp = new MapProperties();
      public MapForm(String rows, String cols)
      {
          InitializeComponent();
           _col = int.Parse(cols);
          _row = int.Parse(rows);
          Begin();



      }

      Button[,] buttonArray;

      public void Begin()
      {
         int width = groupBox1.Width;
          int height = groupBox1.Height;
          int bW = width / _col;
          int bH = height / _row;

          buttonArray = new Button[_row, _col];


          for (int i = 0; i < _row; i++)
          {
              for (int j = 0; j < _col; j++)
              {
                  Button button = new Button();
                  buttonArray[i, j] = button;
                  button.Width = bW;
                  button.Height = bH;
                  button.Left = j * bW;
                  button.Top = i * bH;
                  button.Tag = 0;

                  button.Click += new EventHandler(button_Click);

                  groupBox1.Controls.Add(button);







              }
           }
      }

      void button_Click(object sender, EventArgs e)
      {
          Button button = (Button)sender;
          int count = (int)button.Tag;

             if ( count < 3)
             {
                 count++;
              if (count == 1)
              {

                  button.Text = "1";
                  button.BackColor = Color.LightBlue;

              }

              if (count == 2)
              {
                  button.Text = "2";
                  button.BackColor = Color.LightSlateGray;
              }
              if (count == 3)
              {
                  button.Text = "3";
                  button.BackColor = Color.LightSeaGreen;

              }
              if(count >= 3)
                 {
                     count = 0; //reset to 0 to restart if loop
                 }
             }

              button.Tag = count;  //store count to tag
          }

      private void Save_Click(object sender, EventArgs e) //save button event
      {
          Stream myStream;
          SaveFileDialog saveFileDialog1 = new SaveFileDialog();

          saveFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
          saveFileDialog1.FilterIndex = 2;
          saveFileDialog1.RestoreDirectory = true;

          if (saveFileDialog1.ShowDialog() == DialogResult.OK)
          {
              if ((myStream = saveFileDialog1.OpenFile()) != null)
              {


                  StringBuilder sb = new StringBuilder();

                  for (int i = 0; i < _col; i++)
                  {
                      for (int j = 0; j < _row; j++)
                      {
                          sb.Append(buttonArray[j, i].Text);
                          sb.Append(",");
                      }

                  }
                  sb.ToString();

                  myStream.Close();
              }
          }

      }