public class ValidateUser : IPagePlugin
    {
        public TextContent ValidateUser(string userName, string passWord)
        {
            var textFolder = new TextFolder(Repository.Current, "User_Identity");
            var query = textFolder.CreateQuery().WhereEquals("Username", userName).WhereEquals("Password", passWord);
            return query.FirstOrDefault();

        }
        public string Description
        {
            get { return "Validate User Plugin"; }
        }

        public System.Web.Mvc.ActionResult Execute(Kooboo.CMS.Sites.View.Page_Context pageContext, Kooboo.CMS.Sites.View.PagePositionContext positionContext)
        {
            var request = pageContext.ControllerContext.RequestContext.HttpContext.Request;
            if (string.Equals(request.HttpMethod, "post", StringComparison.OrdinalIgnoreCase))
            {
                var entry = new JsonResultEntry();
                entry.Success = false;
                try
                {
                    var user = ValidateUser(request["username"], request["passwordLog"]);
                    pageContext.ControllerContext.HttpContext.Session["UserInfo"] = user;
                    var result = user != null;
                    entry.Model = result;
                    if (result)
                    {
                        var privateArea = pageContext.FrontUrl.PageUrl("privateArea");
                        entry.RedirectUrl = privateArea.ToString();
                    }

                    entry.SetSuccess();

                }
                catch (Exception e)
                {
                    entry.AddException(e);
                }
                JsonResult jsonResult = new JsonResultEx(pageContext.ControllerContext.HttpContext.Request.ContentType);
                jsonResult.Data = entry;
                return jsonResult;
            }
            return null;
        }
    }