在datatable中添加一序号列

http://topic.csdn.net/t/20050324/09/3876414.html

int  colLength  =  dt.Rows. Count ;
             int  rowLength  =  dt.Columns. Count ;
            DataRow []  newRows  =  new DataRow [ rowLength ] ;
            DataTable subDT  =  new DataTable();
           
             for  ( int  i  =   0 ; i  <  colLength; i ++ )
            {
                subDT.Columns. Add ();
                 for  ( int  j  =   0 ; j  <  rowLength; j ++ )
                {
                    
                     if  (newRows [ j ]   ==   null ) newRows [ j ]   =  subDT.NewRow();
                    newRows [ j ][ i ]   =  dt.Rows [ i ][ j ] ;

                }
            }
            foreach (DataRow row  in  newRows)
            {
                subDT.Rows. Add (row);
            }
            DataRow dr  =  subDT.NewRow();   
       dr [ 0 ] = "aaa";   
       dr [ 1 ] = "bbb";
       subDT.Rows. Add (dr);


            GridView3.DataSource  =  subDT;
            GridView3.DataBind();