How do I add a timestamp to a DataGridView

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C#

DataGridView

time

How do I add a timestamp to a gridview that shows the last time a row was edited? I've been searching Google but haven't found anything helpful yet.

I tried to create a method which will update the time when you edit or add a column. but i dont know how to take it further like parsing it to each and every column.

My table columns

private DataTable GetDataTableFromDataGridview(DataGridView _grid)
{
  {
        var _oDataTable = new DataTable();
        object[] cellValues = new object[_grid.Columns.Count];
         //clearTable();
        _oDataTable.Columns.Add("Name", typeof(string));
        _oDataTable.Columns.Add("Value", typeof(string));
        _oDataTable.Columns.Add("Font", typeof(string));
        _oDataTable.Columns.Add("DateStamp", typeof(string));
        _oDataTable.Columns.Add("Comment", typeof(string));
        foreach (DataGridViewRow row in _grid.Rows)
        {
            for (int i = 0; i < row.Cells.Count; i++)
            {
                cellValues[i] = row.Cells[i].Value;
            }
            _oDataTable.Rows.Add(cellValues.ToArray());
        }
        return _oDataTable;
    }

}

My method

private DateTime _dateTime;
string _DateTimeFormat = "yyyy/dd/MM HH:mm:ss";
public void UpdateTheCurrentTime()
{
   _dateTime = DateTime.Now;
   _dateTime.ToString(_DateTimeFormat, CultureInfo.InvariantCulture);
}

[Edit member="Tadit"]
Corrected formatting and/or grammatical issues.
Added pre tags.
[/Edit]