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POCustom validation error not displayed
 

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    <p>I have an MVC 3 application and am trying to display a custom validation error. The normal validation errors that are generated by the model, i.e. Required, are displayed on the page. Now I am checking if a user exists and if so, adding a error message:</p> <pre><code>if (userExists) ModelState.AddModelError("UserName", UserManagementResources.UserAlreadyExistsText); return View(model); </code></pre> <p>On the view I have a validation summary and a Html.ValidationMessage("UserName"), but neither one is displaying the error. I have used this successfully on other pages. The only difference with this page I can see is, that it uses the RequiredIf validator scripts. <a href="http://blogs.msdn.com/b/simonince/archive/2011/02/04/conditional-validation-in-asp-net-mvc-3.aspx" rel="nofollow">http://blogs.msdn.com/b/simonince/archive/2011/02/04/conditional-validation-in-asp-net-mvc-3.aspx</a> </p> <p>Any ideas how to solve this problem are appreciated. Thanks.</p> <hr> <p>Edit</p> <p>I am returning the validation message through the Remote validation. If I look what the network is doing, it's returning the error message, but it is still not displayed on the view.</p> <pre><code>[Required] [DataType(DataType.EmailAddress)] [Remote("IsUserAvailable", "Validation", ErrorMessage = "Ein Benutzer mit dieser Email existiert bereits.")] [Display(Name = Resources.EmailText, ResourceType = typeof(Resources))] public string Email { get { return User.Email; } set { User.Email = value; } } </code></pre> <p>The View:</p> <pre><code>@Html.LabelFor(u =&gt; u.Email, Resources.Email + " (Login) *") @Html.EditorFor(u =&gt; u.Email) @Html.ValidationMessageFor(u =&gt; u.Email) &lt;br clear="all" /&gt; </code></pre> <p>The Remote Validation Controller:</p> <pre><code>public class ValidationController : Controller { public JsonResult IsUserAvailable(string Email) { bool userExists; using (var userModel = new UserManagementModel()) { userExists = userModel.UserExists(Email); } if(userExists) return Json(UserManagementResources.UserAlreadyExists, JsonRequestBehavior.AllowGet); else return Json(true, JsonRequestBehavior.AllowGet); } } </code></pre>
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