C# DataGridView's SetValue

When a DataTable is set for a DataGridView, the value can not be set
to DataGridViewCellFormattingEventArgs.Value, which is passed by to a
method that is hooked to CellFormatting event.

The way to avoid it, is to access to the cell value directly.

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
  if(e.ColumnIndex==5)
    {
      // If set, the following will be shown in the cell.  The Cell's value typed as an int will not be set correctly.
      //e.Value = "1";
                        
      // Instead, directly access the Cell object.
      int row = e.RowIndex;
      int col = e.ColumnIndex;
      dataGridView1.Rows[row].Cells[col].Value = 1;
                   
      break;
    } 
}