一个简单的数据库操作类

using System;
  using System.Data;
  using System.Data.SqlClient;
  namespace exchange
  {
   public class MyDataOp
  {
  private String StrSql;
  private String StrConn;
  private SqlConnection Conn;
  public MyDataOp(String ss)
  {
   StrSql = ss;
   StrConn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
  }
 
  public SqlDataReader CreateReader()
  {
   Conn=new SqlConnection(StrConn);
   SqlCommand Comm=new SqlCommand(StrSql,Conn);
   Conn.Open();
   SqlDataReader MyReader = Comm.ExecuteReader();
   return MyReader;
  }
  public DataSet CreateDataSet()
  {
   Conn=new SqlConnection(StrConn);
   Conn.Open();
   SqlDataAdapter Adpt=new SqlDataAdapter(StrSql,Conn);
   DataSet Ds=new DataSet();
   Adpt.Fill(Ds);
   return Ds;
  }
  public SqlCommand ExecuteCommand()
  {
   Conn=new SqlConnection(StrConn);
   SqlCommand Comm=new SqlCommand(StrSql,Conn);
   Conn.Open();
   Comm.ExecuteNonQuery();
   return Comm;
  }
  public void Close()
  {
   Conn.Close();
  }
     }
 }

----------------------------------------------------------------------------
namespace exchange
  {
   using System;
   using System.Web.UI;
   using System.Web.UI.WebControls;
   using System.Data;
   using System.Data.SqlClient;
   using System.Web;
   using System.Security.Cryptography;
   public class newjoin : System.Web.UI.UserControl
   {
 
    protected DataList newjoinlist;
    public newjoin()
    {
     this.Init += new System.EventHandler(Page_Init);
    }

   protected void Page_Load(object sender, System.EventArgs e)
  {
   if(!IsPostBack)
   {
    LoadData();
   }
         }
 
  protected void LoadData()
  {
   String StrSql = "select top 10 id,left(corpname,13) as corpname from crop order by id desc";
   MyDataOp mdo = new MyDataOp(StrSql);
   DataSet ds = mdo.CreateDataSet();
   newjoinlist.DataSource =  ds.Tables[0].DefaultView;
   newjoinlist.DataBind();
   mdo.Close();
  }

  private void Page_Init(object sender, EventArgs e)
  {
   InitializeComponent();
  }
  private void InitializeComponent()
  {   
   this.Load += new System.EventHandler(this.Page_Load);
  }
 }
  }