App_Code/dbcon.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.OleDb;

/// <summary>
/// dbcon 的摘要说明
/// </summary>
/// 

public class dbcon
{
	public dbcon()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}

    public static OleDbConnection createconnection()
    {
        OleDbConnection conn = new OleDbConnection("PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA Source=" + HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath + System.IO.Path.AltDirectorySeparatorChar + "DB_51Aspx/" + System.Configuration.ConfigurationManager.AppSettings["ConnectionString"]));
        return conn;
    }
}