关于asp.net 所有登陆页面有关数据库的代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("style", "background-color:transparent");
TextBox2.Attributes.Add("style", "background-color:transparent");
if (Request["p"]!=null)
{
Session["usr"] = null;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
ConnDbForAcccess conn = new ConnDbForAcccess();
DataSet ds = conn.ReturnDataSet("select * from login where