datatable，datareader，dataset，SqlDataAdapter 应用

sqlDataAdapter sda = new SqlDataAdapter("select * from Couse",con);
DataSet ds = new DataSet();
sda.Fill(ds);
DataTable dt = new DateTable();
dt = ds.Table[0];

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SqlCommand com = new SqlCommand(sql, conn);
SqlDataReader dr = com.ExecuteReader();
DataTable dt=new DataTable();
dt.Load(dr);

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using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["AdventureWorksConnectionString"].ConnectionString);
con.Open();
string str = "SELECT * FROM Person.[Address] ";
SqlCommand cmd = new SqlCommand(str,con);
SqlDataReader sdr = cmd.ExecuteReader();
SqlDataAdapter sda = new SqlDataAdapter();
myclass my = new myclass();
DataTable dt = new DataTable();
my.MyFill(dt, sdr);
con.Close();

this.GridView1.DataSource = dt;
this.GridView1.DataBind();
}

public class myclass : System.Data.Common.DbDataAdapter
{
protected override int Fill(DataTable dataTable, IDataReader dataReader)
{
return base.Fill(dataTable, dataReader);
}

public int MyFill(DataTable dataTable, IDataReader dataReader)
{
return Fill(dataTable, dataReader);
}
}
}