title: Add new blank row in CellBeginEdit Event
body: <p>My <code>DataGridView</code> is binded by a <code>DataTable</code> and it is set to Enable Adding.
  <br>In <code>CellBeginEdit</code> event, I add value to a cell of new row with cell-value of upper row.Like this-<br></p>
  
  <pre><code> private void dgGrid_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
  {
  dgGrid[intCol, intLastRow].Value = dgGrid[intCol, intLastRow-1].Value;
  }
  </code></pre>
  
  <p>Whether I can set value to new cell, but there is no new row automatically appear at the below.<br> When I  type something in this cell, new row will automatically appeared,but I want to display new blank row at the below before typing something.</p>