常见的类整理

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.Data.SqlClient;
using System.Drawing;
using System.Text.RegularExpressions;//regex
using System.Text;//Encoding
using System.Security;//登录验证
using System.IO;

}