public class Image
        {
            public int ID { get; set; }
            public string ImagePath { get; set; }
            public string Category { get; set; }
        }
        public class ImageDBContext : DbContext
        {
            public DbSet<Image> Images { get; set; }
        }
    }

[HttpGet]
public ActionResult Search(string category)
{
    var myList = db.Images.ToList();
    if (!string.IsNullOrEmpty(category))
    {
        myList = db.Images.Where(s => s.Category == category).ToList();
    }

    return View(myList);
}

<button>@Html.ActionLink("Extras", "Search", new { Category = "Extras" })</button>
<button>@Html.ActionLink("Home", "Search", new { Category = "Home" })</button>

<div style="width:800px; margin:200px auto;  text-align:center;">
    <ul class="images">
        @foreach (var item in Model)
        {
            var imagePath = @item.ImagePath;
            imagePath = "/Images/" + imagePath;
            <li class="image-item" style="background: url(@imagePath) no-repeat;"></li>
        }
    </ul>