Numbering datagrid rows from left display to right display

I am working for simple program about Time attendance that connect to Virdi FP devices. There is simple problem which is about numbering row in datagrid so I programmed Arabic application. When numbering datagrid it appears to left and I do not want this. I want it in right format so this is the code I used and the problem in Photo appears

<pre lang="c#">var grid = sender as DataGridView;
 var rowIdx = (e.RowIndex + 1).ToString();

 var leftFormat = new StringFormat()
 {
     Alignment = StringAlignment.Center,
     LineAlignment = StringAlignment.Center
 };

 var headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, grid.RowHeadersWidth, e.RowBounds.Height);
 e.Graphics.DrawString(rowIdx, this.Font, SystemBrushes.ControlText, headerBounds, leftFormat);

var grid = sender as DataGridView;
 var rowIdx = (e.RowIndex + 1).ToString();

 var leftFormat = new StringFormat()
 {
     Alignment = StringAlignment.Center,
     LineAlignment = StringAlignment.Center
 };

 var headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, grid.RowHeadersWidth, e.RowBounds.Height);
 e.Graphics.DrawString(rowIdx, this.Font, SystemBrushes.ControlText, headerBounds, leftFormat);