<"1.0" encoding="utf-8""true" targetFramework="4.0" /> 
 
   <authentication mode="Forms"> 
    <forms name="save" loginUrl="login.aspx" protection="All"> 
    </forms> 
   </authentication> 
 
   <authorization> 
    <deny users=""/> 
   </authorization> 
  </system.web> 
 
 
</configuration> 

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
 
namespace LastTest 
{ 
  public partial class login : System.Web.UI.Page 
  { 
    protected void Page_Load(object sender, EventArgs e) 
    { 
 
    } 
 
    protected void Button1_Click(object sender, EventArgs e) 
    { 
      if (true)  //可以通过查询数据库 验证用户是否合法 
      { 
        //被注释的这两行语句相当于最下面的语句 就是保存用户后转回到原来的页面。 
        //System.Web.Security.FormsAuthentication.SetAuthCookie(TextBox1.Text, chkIsSavePwd.Checked); 
        //Response.Redirect("main.aspx"); 
        System.Web.Security.FormsAuthentication.RedirectFromLoginPage(TextBox1.Text, chkIsSavePwd.Checked); 
      } 
      else 
      { 
 
      } 
    } 
  } 
} 

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
 
namespace LastTest 
{ 
  public partial class main : System.Web.UI.Page 
  { 
    protected void Page_Load(object sender, EventArgs e) 
    { 
 
    } 
 
    protected void Button1_Click(object sender, EventArgs e) 
    { 
      //从浏览器删除from验证票证 
      System.Web.Security.FormsAuthentication.SignOut(); 
      //重新回到登录页面 
      Response.Redirect("login.aspx"); 
    } 
  } 
}