DataTable一列转换成一行

public static DataTable AllbyApply2( )
        {// 
    
            DataTable dt=new DataTable();
            DataTable lastTable=new DataTable();
            DataColumnCollection d=dt.Columns;
            d.Add("ID",typeof(System.Int32)); 
            SqlParameter[] arParams = new SqlParameter[1];    
            SqlDataReader dr = null;
            dr = SqlHelper.ExecuteReader(Globals.ConString, CommandType.StoredProcedure,"GjTest1");
            while (dr.Read())
            {
                string a=dr.GetInt32(0).ToString();
                DataRow row1=dt.NewRow();
                row1["ID"]=a; 
                dt.Rows.Add(row1);
            }

            DataTable newTable = new DataTable();
            DataColumnCollection d1=newTable.Columns;
            
            int count=dt.Rows.Count;
            for( int i=0;i<dt.Rows.Count-1;i++ )
            {
                string str=dt.Rows[i][0].ToString();
                d1.Add(str,typeof(System.Int32));
            }
            
            return newTable;
        }