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POEntity Framework - Validation (server + clientside, jquery) with data annotations, WITHOUT MVC?
 

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    <p>there are several tutorials that explain how to use EF data annotation for forms validation using the MVC framework. And to use jquery for the client side.</p> <p>See e.g.: <a href="http://dotnetaddict.dotnetdevelopersjournal.com/clientvalidation_mvc2.htm" rel="nofollow noreferrer">http://dotnetaddict.dotnetdevelopersjournal.com/clientvalidation_mvc2.htm</a></p> <p>I would like to achieve the same, but without using MVC/MVC2.</p> <p>I want to build a classic asp.net site, create the Entities Model, create my partial classes that include the validation (required, regex etc.).</p> <p>I created the entities model and the partial classes including the data annotations. I can add new records to the DB.</p> <p>What I miss is the validation. Now I can add records to the DB even if the fields are not valid, I would like to get the errors, and if possible I would like to use jquery for the client validation (in MVC you just add <code>&lt;% Html.EnableClientValidation(); %&gt;</code> to the view...).</p> <p>Can you help me? Or point me to some good online resources that explain this?</p> <p>Thanks a lot.</p> <p><strong>EDIT</strong>: I found something here: </p> <p><a href="https://stackoverflow.com/questions/2493800/how-can-i-tell-the-data-annotations-validator-to-also-validate-complex-child-prop">How can I tell the Data Annotations validator to also validate complex child properties?</a></p> <p>I have an Entity called "User" and I created a partial class as follows:</p> <pre><code>using System.ComponentModel; using System.ComponentModel.DataAnnotations; namespace MySite.Models { [MetadataType(typeof(UserMetaData))] public partial class User { } public class UserMetaData { [Required(ErrorMessage = "Username Required")] [DisplayName("Username")] public string Username{ get; set; } [DisplayName("Password")] [Required(ErrorMessage = "Password Required")] [RegularExpression(@"^[^;&gt;;&amp;;&lt;;%?*!~'`;:,."";+=|]{6,10}$", ErrorMessage = "The password must be between 6-10 characters and contain 2 digits")] public string Password{ get; set; } } } </code></pre> <p>In the code behind of my page I've put a similar "isValid" check as in the above mentioned link:</p> <pre><code>var validationContext = new ValidationContext(person, null, null); var validationResults = new List&lt;ValidationResult&gt;(); var isValid = Validator.TryValidateObject(userToAdd, validationContext, validationResults); if (isValid) { savetoDB(); } </code></pre> <p>But when I debug... "isValid" is always "true", even if I leave the fields null. Help :-S</p> <p>EDIT2:</p> <p>It was always "true" because I was filling the "user" properties, as follows:</p> <pre><code>User userToAdd = new User(); userToAdd.Username = txtUsername.Text; userToAdd.Password = txtPassword.Text; </code></pre> <p>I changed the object: from "User" to "UserMetaData" (<code>User userToAdd = new UserMetaData();</code>) then the validation works ("false" in case the regex is not respected) ... but still, quite weird... then I should create another "User" object and fill it again... not very clean...</p>
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