title: DataGridView replace value
body: <p><code>dataGridView</code> has column <code>DataGridViewTextBoxColumn</code>, that reads from my database.<br>
  I need to replace one value to another, example:  </p>
  
  <p>If in field "date" I have value <code>"00.00.0000"</code> - I need to replace it to text <code>"absent"</code>.<br>
  How can i do this?</p>