方法：C#用session做登陆
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Data" %>
<HTML>
<HEAD>
<TITLE> 登陆 的例子 </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<Script Language="C#" runat="server">
void Add_Click (Object sender,EventArgs e)
{
string str_id=Tel1.Text;
string str_name=Tel2.Text;
//Session["id"]=str_name;
//Session["UserName"]=str_name;
SqlCommand myCommand;
string myselect;
string myConnString=@"server=localhost;u;
SqlConnection myConnection =new SqlConnection(myConnString); myConnection.Open(); myselect="Select * from test where id = '"+Tel1.Text+"' and name='"+Tel2.Text+"'"; myCommand=new SqlCommand(myselect,myConnection); SqlDataReader reader=myCommand.ExecuteReader(); //SqlDataReader reader=myCommand.ExecuteReader(); if(Tel1.Text=="" || Tel2.Text=="") { Label1.Text="学号姓名不能为空"; } else if( Session["UserName"]!=null || Session["id"]!=null ) { Label1.Text="你已经登陆"; } else if(!reader.Read()) { Label1.Text="数据库没有信息!"; reader.Close(); } else { Label1.Text="登陆成功"; // Label.Text=Session["Username"].ToString(); //reader.Close(); Tel1.Text=""; Tel2.Text=" "; Session["UserName"]=str_name;; Session["id"]=str_id; //Response.Redirect("first3.aspx"); } myConnection.Close(); } </Script> </HEAD> <BODY> <form runat="server"> 学号: <asp:TextBox /> </form> </BODY> </HTML> 本文来自CSDN博客，转载请标明出处：
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