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    <p>A custom validation attribute is one way to go:</p> <pre><code>public class ValidateFileAttribute : RequiredAttribute { public override bool IsValid(object value) { var file = value as HttpPostedFileBase; if (file == null) { return false; } if (file.ContentLength &gt; 1 * 1024 * 1024) { return false; } try { using (var img = Image.FromStream(file.InputStream)) { return img.RawFormat.Equals(ImageFormat.Png); } } catch { } return false; } } </code></pre> <p>and then apply on your model:</p> <pre><code>public class MyViewModel { [ValidateFile(ErrorMessage = "Please select a PNG image smaller than 1MB")] public HttpPostedFileBase File { get; set; } } </code></pre> <p>The controller might look like this:</p> <pre><code>public class HomeController : Controller { public ActionResult Index() { var model = new MyViewModel(); return View(model); } [HttpPost] public ActionResult Index(MyViewModel model) { if (!ModelState.IsValid) { return View(model); } // The uploaded image corresponds to our business rules =&gt; process it var fileName = Path.GetFileName(model.File.FileName); var path = Path.Combine(Server.MapPath("~/App_Data"), fileName); model.File.SaveAs(path); return Content("Thanks for uploading", "text/plain"); } } </code></pre> <p>and the view:</p> <pre><code>@model MyViewModel @using (Html.BeginForm("Index", "Home", FormMethod.Post, new { enctype = "multipart/form-data" })) { @Html.LabelFor(x =&gt; x.File) &lt;input type="file" name="@Html.NameFor(x =&gt; x.File)" id="@Html.IdFor(x =&gt; x.File)" /&gt; @Html.ValidationMessageFor(x =&gt; x.File) &lt;input type="submit" value="upload" /&gt; } </code></pre>
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    1. POHow to validate uploaded file in ASP.NET MVC?
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    1. USDarin Dimitrov
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    1. CO+1 for the ImageFormat stuff - SOlves a problem I hadn't even thought about yet!
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    2. COthank you so much, really appreciate it.
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    3. COAwesome stuff. Just saved me a lot of time.
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      1. USMajor Productions
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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