MVC3远程验证

    public class StudentModel
    {
        [Display(Name="学生编号")]
        public int StuId { set; get; }

        [Required(ErrorMessage="请输入学生姓名！")]
        [StringLength(,ErrorMessage="姓名长度不能长于10！")]
        [Display(Name="学生姓名")]
        [Remote("ValirStuName","Student",HttpMethod="Post",ErrorMessage="学生姓名已经存在！")]
        public string StuName { set; get; }

        [Display(Name="学生Email")]
        [DataType(DataType.EmailAddress)]
        public string StuSex { set; get; }

        [Display(Name="班级ID")]
        public int Gid { set; get; }

        [Display(Name="学生描述")]
        public string StuDesc { set; get; }
    }

Controller:

        /// <summary>
        /// 参数名称与Model中的名称一致
        /// </summary>
        /// <param name="StuName"></param>
        /// <returns></returns>
        public ActionResult ValirStuName(string StuName)
        {
            return Json(true);
            //return Json("你所填写的用户名，已经存在了!");//当返回不为true时，则默认认为验证失败及自定义的错误信息
            //return new JsonResult { Data=false,JsonRequestBehavior=JsonRequestBehavior.AllowGet };
        }