Validation does not work when two instances of user control exists on the view

I have created an Address user control which is as follow:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Address>" %>

   <div class="span-4" style="text-align: right" title="<%: GetLocalResourceObject("Type") %>">
        <%: GetLocalResourceObject("Type")%>
   </div>
   <div class="span-6 last">
       <%: Html.RadioButtonFor(model => model.AddressType, RealProperty.Core.Domain.AddressType.Postal, new { id = ViewData["AddressPrefix"] + "AddressType" })%>
    &nbsp;
       <%: GetLocalResourceObject("PostalType")%>
       <%: Html.RadioButtonFor(model => model.AddressType, RealProperty.Core.Domain.AddressType.Intersection, new { id = ViewData["AddressPrefix"] + "AddressType" })%>
    &nbsp;
       <%: GetLocalResourceObject("IntersectionType")%>
    </div>
    <div class="span-4" style="text-align: right" title="<%: GetLocalResourceObject("Country") %>">
      <%: GetLocalResourceObject("Country")%>
    </div>
    <div class="span-6 last">
    <%: Html.DropDownList(ViewData["AddressPrefix"] + "Country", new SelectList(RealProperty.Core.Service.CountryService.Countries, "Id", "Name"), "Please select Country", new { id = ViewData["AddressPrefix"] + "Country" })%>
        <%: Html.ValidationMessage(ViewData["AddressPrefix"] + "Country")%>
    </div>
    <div class="span-4" style="text-align: right" title="<%: GetLocalResourceObject("Address1") %>">
       <%: GetLocalResourceObject("Address1")%>
    </div>

 .
 .
 .
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I'll be using two instance of this user control on a page for "Main Address" and "Alternate Address": 开发者_高级运维

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<PhysicalLocation>" %>

   <div class="span-12">
        <fieldset>
            <legend>Main Address</legend>
            <%
                Html.RenderPartial("~/Views/Address/New.ascx", Model.MainAddress);
            %>
        </fieldset>
    </div>
    <div class="span-12 last">
        <fieldset>
            <legend>Alternate Address</legend>
            <%
                Html.RenderPartial("~/Views/Address/New.ascx", Model.AlternateAddress);
            %>
        </fieldset>
    </div>

Address user control is bound to "Address" model.

 [PostalCode("PostalCode", "Country", ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "PostalCode_Is_Invalid"), DisplayName("Address") ]
    public class Address : ICanBeValidated
    {

        public virtual long Id { get; set; }

        [RegularExpression("^[^,'\"]*$", ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "InvalidCharacter"),
    Required(ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "Field_Required"), StringLength(255, ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "Field_Max_Length_Allowed")]
        public virtual string Address1 { get; set; }

        [RegularExpression("^[^,'\"]*$", ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "InvalidCharacter"),
    StringLength(255, ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "Field_Max_Length_Allowed")]
        public virtual string Address2 { get; set; }

        [RegularExpression("^([a-zA-Z\\.\\-\\s]*)$", ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "ValidCharacter_Allowed")]
        [Required(ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "Field_Required"), StringLength(30, ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = "Field_Max_Length_Allowed")]
        public virtual string City { get; set; }
    .
    .
    .
 }

I expect upon render, it creates two differnet sets of input controls for MainAddress and AlternateAddress (i.e. coming from Web Form experience).

I'm guessing that I'm missing a very basic point here, since when both user controls are rendered, on the page I have two "city","address1", "address2", etc.

And as the result Microsoft Validation only works for one of the user controls. The JSON array that is sent to client only contains the validation for one, base on the Model definition. For example for “City” property of the address we have only one entry in the mentioned array and as the result only the "span" element with id "City_ValidateMessage" associated to validation exists.

I appreciate any thoughts.

Thanks, Mohammad

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If you're using 2 instances on the page, does your model have 2 sets of properties to store the address?

Your model should be:

Class DoubleAddressViewModel()
    <PropertiesForAddressMain>
    <PropertiesForAddressAlternate>
End Class

From your comments above, I'm guessing you've got a model which represents a single address

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The solution that I found on Steve Sanderson's blog is a hack on HttpContext to generate unique ids when rendering the user control. It solves the problem with validation nicely.