public ActionResult Index(){...} 

[Authorize(Roles = "admins")] 

[Authorize(Roles = "admins")] 
public ActionResult Index() 
{ 
  ... 
} 

<authentication mode="Forms"> 
   <forms loginUrl="~/Login" timeout="2880" /> 
</authentication> 

public class LogOnModel 
  { 
    [Required] 
    [Display(Name = "用户名")] 
    public string UserName { get; set; } 
 
 
    [Required] 
    [DataType(DataType.Password)] 
    [Display(Name = "密码")] 
    public string Password { get; set; } 
 
 
    [Display(Name = "下次自动登陆")] 
    public bool RememberMe { get; set; } 
  } 

@model Weibo.Models.LogOnModel //LogOnModel 是CDBTemplate.cs文件里的一个类 
@using (Html.BeginForm("Login","Login",FormMethod.Post)) { 
  @Html.TextBoxFor(m => m.UserName) 
        @Html.ValidationMessageFor(m => m.UserName, "请输入用户名！", new {style="color: #f00" }) 
@Html.PasswordFor(m => m.Password) 
        @Html.ValidationMessageFor(m => m.Password,"请输入密码！",new {style="color: #f00" }) 
@Html.CheckBoxFor(m => m.RememberMe) 
        @Html.LabelFor(m => m.RememberMe) 
@Html.ActionLink("忘记密码", "forgotpwd", null, new {@class="rt",target="_blank" }) 
<input type="submit" value="登陆微博" /> 
}

[HttpPost, ActionName("Login")] 
    public void Login(FormCollection collection) 
    { 
      object obj = SqlHelper.ExecuteScalar("select UserId from CDBUsers where UserName=@uname and Password=@pwd", 
         new SqlParameter("@uname", collection[0]), 
         new SqlParameter("@pwd", Weibo.Models.Myencrypt.myencrypt(collection[1]))); 
 
 
      if (obj != null) 
      { 
        FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket( 
          1, 
          collection[0], 
          DateTime.Now, 
          DateTime.Now.AddMinutes(30), 
          false, 
          "admins" 
          ); 
        string encryptedTicket = FormsAuthentication.Encrypt(authTicket); 
        System.Web.HttpCookie authCookie = new System.Web.HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket); 
        System.Web.HttpContext.Current.Response.Cookies.Add(authCookie); 
      } 
 
 
      Response.Redirect("~/"); 
    }