Programmatically set the width of the GridView Column

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
 {       e.Row.Cells[1].Width = 1;     
         e.Row.Cells[0].Width = 1;      
         e.Row.Cells[4].Width = 75;      
         e.Row.Cells[5].Width = 1;                
 }