Aspx比较简单的登录

  客户端
 <form id="form1" runat="server">
     <div>
     用户名:<input type="text" name="txtName"  value="<%=UserName %>"/><br />
         密码:<input type="password" name="txtPwd" /><br />
         <input type="submit" value="登录" />
     </div>
     </form>

 服务器端
 public partial class Login : System.Web.UI.Page
     {
         public string UserName;
         protected void Page_Load(object sender, EventArgs e)
         {
             if (Request.Cookies["userName"] != null)
             {
                 string name = Request.Cookies["userName"].Value;
                 UserName = name;
                 Response.Cookies["userName"].Value = name;
                 Response.Cookies["userName"].Expires = DateTime.Now.AddDays();
             }
             else
             {
                 if (IsPostBack)
                 {
                    string name= Request.Form["txtName"];
                    Response.Cookies["userName"].Value = name;
                    Response.Cookies["userName"].Expires = DateTime.Now.AddDays();
                 }
             }
         }
     }