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POASP.Net MVC Error Validation
 

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    <p>I have an error validation issue with an int. </p> <p>I have validation for a customer name:</p> <pre><code>if (String.IsNullOrEmpty(CustomerName)) yield return new RuleViolation("Customer Name Required", "CustomerName"); </code></pre> <p>now if I want to add validation for a city, in this case I have a CityID that gets saved as type int, so I can't write my if statement the same way...because there's no int.IsNullOrEmpty method. Let's say the user didn't select the dropdown for city - it's basically saving with no value.</p> <p>What's the best way to write my validation statement for an int?</p> <p>UPDATE:Here's a sample of what I have for my form in my view:</p> <pre><code>&lt;% using (Html.BeginForm()) {%&gt; &lt;fieldset&gt; &lt;legend&gt;Add a new customer&lt;/legend&gt; &lt;p&gt; &lt;label for="CustomerName"&gt;Customer Name:&lt;/label&gt; &lt;%= Html.TextBox("CustomerName")%&gt; &lt;%= Html.ValidationMessage("CustomerName", "*")%&gt; &amp;nbsp;&amp;nbsp; &lt;label for="CityID"&gt;City:&lt;/label&gt; &lt;%= Html.DropDownList("CityID", Model.Cities as SelectList, "Select City")%&gt; &lt;%= Html.ValidationMessage("CityID", "*")%&gt; &amp;nbsp;&amp;nbsp; &lt;input type="submit" value="Create New Customer" /&gt; &lt;/p&gt; &lt;/fieldset&gt; &lt;% } %&gt; </code></pre> <p>and my view model looks like this:</p> <pre><code>public class CustomerFormViewModel { //Properties public Customer Customer { get; set; } public SelectList Cities { get; set; } //Constructor public CustomerFormViewModel(Customer customer) { CustomerRepository customerRepository = new CustomerRepository(); Customer = customer; Cities = new SelectList(customerRepository.FindAllCities(), "CityID", "CityName"); } } </code></pre>
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