Question

Hi! i try to learn Asp.net MVC.i created a sample application to learn it. But press f5 return server error. Where do l make a mistake? where is the problem? there is a navigator bar Home/About/Product . if i press Product, error return to me.

Cotroller:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplication1.Models.Db;

namespace MvcApplication1.Controllers
{
    public class ProductsController : Controller
    {
        //
        // GET: /Products/

        public ActionResult GetAll()
        {
            using (var ctx = new MyDbEntities())
            {
                ViewData["Products"] = ctx.Products;
                return View();
            }

        }

    }
}

View:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<MvcApplication1.Models.Db.Product>" %>
<%@ Import Namespace="MvcApplication1.Models.Db" %>
<%@ Import Namespace="MvcApplication1.Controllers" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    ProductDetail
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <h2>ProductDetail</h2>
    <ul>

<% foreach (var m in (IEnumerable<Products>)ViewData["Products"])
     { %>

     <li><%= m.ProductName %></li>

<% } %>
</ul>

</asp:Content>

site.Master:

            <div id="menucontainer">

                <ul id="menu">              
                    <li><%: Html.ActionLink("Home", "Index", "Home")%></li>
                    <li><%: Html.ActionLink("About", "About", "Home")%></li>
                     <li><%: Html.ActionLink("Product", "ProductDetail", "Product")%></li>
                </ul>

            </div>

Answer 1

<%: Html.ActionLink("Product", "ProductDetail", "Product")%>

the action name ProductDetail is not in your controller you have GetAll action name

u need

 public ActionResult ProductDetail()
    {
        using (var db = new NorthwindEntities())
        {
            return View(db.Products.ToList());
        }
    }