App_Code/DataModule.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
//该源码首发自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)

/// <summary>
/// dataModul 的摘要说明
/// </summary>
public class DataModule
{
    private string fConnectString;//数据库联接字符串
    protected SqlConnection Conn = null;//数据连接对象
    protected SqlDataAdapter DataAdapter = null;//数据提供对象
    protected SqlCommand Command = null;//数据执行对象
    public DataSet DataSetobj = null;//数据集对象
    public DataModule()//连接数据库
	{
        try
        {
            fConnectString = System.Configuration.ConfigurationManager.AppSettings["Connectionstring"];
            Conn = new SqlConnection(fConnectString);
            DataAdapter = new SqlDataAdapter();
            DataSetobj = new DataSet();
            Command = new SqlCommand();
           
        }
        catch(Exception e)
        {
            Console.WriteLine("database access error:"+e.Message);
            
        }
	
	}
    public bool QueryDataSet(string aSql, string aDatasetName)//查询数据库
    {
       //Conn.Open();
        try
        {
            Conn.Open();
            DataAdapter.SelectCommand = new SqlCommand(aSql, Conn);
            DataAdapter.Fill(DataSetobj, aDatasetName);
        }
        catch (Exception ex)
        {
            Console.WriteLine("database access error:" + ex.Message);
            return false;
        }
        finally
        {
            Conn.Close();
        }
        return true;