SQLDataReader vs Dataset

Objective:
To compare and contrast SQLDataReader and SQLDataSetCommand

Target Audience
ADO.NET programmer

Environment
SQL2000, Visual studio .NET Beta 1
ibuyspy DataBase

Structure Of Table
CREATE TABLE [dbo].[OrderDetails] (
[OrderID] [int] NOT NULL ,
[ProductID] [int] NOT NULL ,
[Quantity] [int] NOT NULL ,
[UnitCost] [money] NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[Products] (
[ProductID] [int] IDENTITY (1, 1) NOT NULL ,
[CategoryID] [int] NOT NULL ,
[ModelNumber] [nvarchar] (50) COLLATE Korean_Wansung_CI_AS NULL ,
[ModelName] [nvarchar] (50) COLLATE Korean_Wansung_CI_AS NULL ,
[ProductImage] [nvarchar] (50) COLLATE Korean_Wansung_CI_AS NULL ,
[UnitCost] [money] NOT NULL ,
[Description] [nvarchar] (3800) COLLATE Korean_Wansung_CI_AS NULL
) ON [PRIMARY]

Stored Procedure
/* procedure name:NET_PopularProduct_SelectMaster
 * objective           :Weekly Best Items top 5
 */

CREATE PROCEDURE NET_PopularProduct_SelectMaster 
as 
BEGIN 
 select top 5 o.productid,sum(o.quantity) as total,p.modelname 
 from orderdetails o,products p 
 where o.productid=p.productid 
 group by o.productid,p.modelname 
 order by total desc 
END 
 
*****************Source Code

1)Using SQLDataSetCommand

Conn=new Common.DBConn();
SQLDataSetCommand Comm=new SQLDataSetCommand("NET_PopularProduct_SelectMaster",Conn);
Comm.SelectCommand.CommandType=CommandType.StoredProcedure;
DataSet ds=new DataSet();
Comm.FillDataSet(ds,"PopItems");
return ds;

2)Using SQLDataReader

Conn=new Common.DBConn();
SQLCommand Comm=new SQLCommand("NET_PopularProduct_SelectMaster",Conn);
Comm.CommandType=CommandType.StoredProcedure;
Conn.Open();
Comm.Execute(out reader);
DataTable table=new DataTable("Top5");
table.Columns.Add(new DataColumn("Product_ID",typeof(System.Int32)));
table.Columns.Add(new DataColumn("Quantity",typeof(System.Int32)));
table.Columns.Add(new DataColumn("Product_Name",typeof(System.String)));

while(reader.Read())
{
datarow=table.NewRow();
datarow[0]=reader.GetInt32(0);
datarow[1]=reader.GetInt32(1);
datarow[2]=reader.GetString(2);
table.Rows.Add(datarow);
}
Conn.Close();
return table;

                                   

3) Using SQLDataSetCommand 0.0550645255       0.0126954643     0.0131178647 (SEC) 
    Using SQLDataReader --     0.0105256364       0.0104242265    0.0105105508