removing row header in datagrid view programmatically

I have a Datagrid view, and I want to remove the row header for all rows...

I am trying to remove the rounded part as shown in the below figure (Row header)

For that, I have written the code below.... but it's not working...

     private void dgvProducts_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
     {
         e.PaintCells(e.ClipBounds, DataGridViewPaintParts.All);

         e.PaintHeader(DataGridViewPaintParts.All
             | DataGridViewPaintParts.Border
             | DataGridViewPaintParts.None
             | DataGridViewPaintParts.SelectionBackground
             | DataGridViewPaintParts.ContentBackground);

         e.Handled = true;

     }

Would any pls give any sample code for removing the row header in Datagrid view .....

Many thanks. In advance.....