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POError Posting edit data in ASP.NET MVC
 

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    <p>Can someone explain why the model object is null. I checked the post values coming across the wire and all of them are populated.</p> <p>Using VS2010 Beta 2,WinXp SP2,however this works in VS2008 ??!!</p> <p>Yellow screen of death message</p> <blockquote> <p>Server Error in '/' Application. Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.</p> <p>Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.</p> <p>Source Error:</p> <pre><code>Line 17: &lt;p&gt; Line 18: &lt;label for="id"&gt;id:&lt;/label&gt; Line 19: &lt;%= Html.TextBox("id", Model.id) %&gt; &lt;--Error Line 20: &lt;%= Html.ValidationMessage("id", "*") %&gt; Line 21: &lt;/p&gt; </code></pre> </blockquote> <p>Controller Code</p> <pre><code> [AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(Contact contactToEdit) { if (contactToEdit.FirstName.Trim().Length == 0) ModelState.AddModelError("FirstName", "First name is required."); if (contactToEdit.Lastname.Trim().Length == 0) ModelState.AddModelError("LastName", "Last name is required."); if (contactToEdit.Phone.Length &gt; 0 &amp;&amp; !Regex.IsMatch(contactToEdit.Phone, @"((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}")) ModelState.AddModelError("Phone", "Invalid phone number."); if (contactToEdit.Email.Length &gt; 0 &amp;&amp; !Regex.IsMatch(contactToEdit.Email, @"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$")) ModelState.AddModelError("Email", "Invalid email address."); if (!ModelState.IsValid) return View(); try { // TODO: Add update logic here var con = (from c in _entities.Contacts where c.id == contactToEdit.id select c).FirstOrDefault(); _entities.ApplyCurrentValues(con.EntityKey.EntitySetName, contactToEdit); _entities.SaveChanges(); return RedirectToAction("Index"); } catch { return View(); } } </code></pre> <p>Snippet of View code</p> <pre><code>&lt;%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage&lt;JQGallery.Models.Contact&gt;" %&gt; ... &lt;%= Html.ValidationSummary("Edit was unsuccessful. Please correct the errors and try again.") %&gt; &lt;% using (Html.BeginForm()) {%&gt; &lt;fieldset&gt; &lt;legend&gt;Fields&lt;/legend&gt; &lt;p&gt; &lt;label for="id"&gt;id:&lt;/label&gt; &lt;%= Html.TextBox("id", Model.id) %&gt; &lt;%= Html.ValidationMessage("id", "*") %&gt; &lt;/p&gt; &lt;p&gt; &lt;label for="FirstName"&gt;FirstName:&lt;/label&gt; &lt;%= Html.TextBox("FirstName", Model.FirstName) %&gt; &lt;%= Html.ValidationMessage("FirstName", "*") %&gt; &lt;/p&gt; &lt;p&gt; ... </code></pre>
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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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