比较 C# 中从 ToArray() 方法返回的字符串值

以下是我编写的代码，用于在广告表中按名称搜索特定项目。

public ActionResult SearchResult(string name)
{
    var advertisement = db.Advertisements.ToArray(); // retrieve data from database
    foreach (var ad in advertisement)
    {
        if (ad.Title.Equals(name))
        {
            return View(ad); 
        }
    }
    return View(advertisement);
}

即使我搜索数据库中已有的项目，在所有情况下，if 条件都不为真。每次我在视图页面中获取整个项目列表作为结果时。这里有什么问题？

我的广告模型如下所示。

using System;
using System.Drawing; // Image type is in this namespace
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
namespace Bartering.Models
{
    public class Advertisement
    {
        [Key]
        public int ID { get; set; }
        [Required]
        [StringLength(100)]
        public string Title { get; set; }
        public Guid OwnerID { get; set; }
        [Required]
        public string Category { get; set; }
        public byte[] Image { get; set; }
        [Required]
        [StringLength(200)]
        public string Description { get; set; }
     }
}

public ActionResult SearchResult(string name)
{
   var ad=db.Advertisements.Where(s=>s.Title.ToUpper()==name.ToUpper())
                  .FirstOrDefault();
   if(ad!=null)
      return View(ad);
   //Nothing found for search for the name, Let's return the "NotFound" view
   return View("NotFound");
}