title: Windows Forms: Extra columns in DataGridView
body: <p>My DataGridView is showing extra columns. The application is a windows forms application. What could I be doing wrong?</p>
  
  <pre><code>public ConvertisForm1()
      {
          InitializeComponent();
          openFileDialog.Filter = "Files| *.chm;*.htm;*.html;*.rtf;*.xls;*.xlsx;*.xps;*.doc;*.docx";    
      dataGridView.AutoGenerateColumns = false;
      dataGridView.RowHeadersVisible = false;
      dataGridView.ColumnCount = 5;
  
      dataGridView.RowCount = 20;
      //delete button
      var deleteDataGridViewButtonColumn = new DataGridViewButtonColumn
      {
          HeaderText = "",
          Name = deleteDataGridViewButtonColumnName,
          Text = "X",
          Width =20
      };
      dataGridView.Columns.Insert(DeleteColumnIndex, deleteDataGridViewButtonColumn);
  
      dataGridView.Columns[FileNameAndPathColumnIndex].Width=250;
      dataGridView.Columns[FileNameAndPathColumnIndex].HeaderText = "File Path";
  
      //browse button
      var browseDataGridViewButtonColumn = new DataGridViewButtonColumn
      {
          HeaderText = "",
          Name = browseDataGridViewButtonColumnName,
          Text = "...",
          Width = 30
      };
      dataGridView.Columns.Insert(BrowseButtonColumnIndex, browseDataGridViewButtonColumn);
  
      //convert to dropdown
      var convertToDataGridViewComboBoxColumn = new DataGridViewComboBoxColumn
      {
          HeaderText = "Convert to",
          Name = convertToDataGridViewComboBoxColumnName,
          DataSource = new ArrayList { convertToComboBoxDefault, "pdf", "word"},
          Width = 100,
          DefaultCellStyle =
          {
              NullValue = convertToComboBoxDefault,
              DataSourceNullValue = convertToComboBoxDefault
          }
      };
  
      dataGridView.Columns.Insert(ConvertToFileTypeColumnIndex, convertToDataGridViewComboBoxColumn);
  
      var convertDataGridViewButtonColumn = new DataGridViewButtonColumn
      {
          HeaderText = "",
          Name = convertDataGridViewButtonColumnName,
          Text = "Convert",
          Width = 50
      };
      dataGridView.Columns.Insert(ConvertButtonColumnIndex, convertDataGridViewButtonColumn);
      dataGridView.AllowUserToResizeColumns = false;
      dataGridView.AllowUserToResizeRows = false;
      #endregion
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ANXod.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ANXod.jpg" alt="enter image description here"></a></p>