App_Code/DbHelper.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;
using System.Collections;
//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)

/// <summary>
/// DbHelper 的摘要说明
/// </summary>
public class HelperOledb
{
        protected static string connectionString = "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"]);
        public HelperOledb()
        {
        }

        #region 公用方法

        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = HelperOledb.GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }
        public static bool Exists(string strSql)
        {
            object obj = HelperOledb.GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        public static bool Exists(string strSql, params OleDbParameter[] cmdParms)