阻止DataGird 的某一列排序

public class MyDataGrid : DataGrid
{
   protected override void OnMouseDown(MouseEventArgs e)  
  { 
    Point pt = new Point(e.X, e.Y);
    DataGrid.HitTestInfo hti = this.HitTest(pt);
     if(hti.Type == HitTestType.ColumnHeader && hti.Column == 1) 
      {
         //col 1 不排序
         return; //don't call baseclass 
       } 
     base.OnMouseDown(e);
    }
}

参考资料：
http://www.syncfusion.com/FAQ/WindowsForms/FAQ_c44c.aspx