@Html.TextBoxFor(m => m.LastName, new { @class = "class-name", placeholder = "last name" })

<system.webServer>
  <rewrite>
    <rules>
      <rule name="Enforce WWW" stopProcessing="true">
           <match url=".*" />
           <conditions>
                  <add input="{CACHE_URL}" pattern="^(.+)://(?!www)(.*)" />
          </conditions>
          <action type="Redirect" url="{C:1}://www.{C:2}" redirectType="Permanent" />
       </rule>      
    </rules>
  </rewrite>
</system.webServer>

<system.webServer>
  <rewrite>
    <rules>
     <rule name="SEO - Lower case" stopProcessing="false">
       <match url="(.*)" ignoreCase="false" />
       <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
  <add input="{HTTP_METHOD}" pattern="GET" />
  <add input="{R:1}" pattern="[A-Z]" ignoreCase="false" />
       </conditions>
       <action type="Rewrite" url="_{ToLower:{R:1}}" />
    </rule>
    </rules>
  </rewrite>
</system.webServer>

<!-- SEO rules (from: http://www.seomoz.org/blog/what-every-seo-should-know-about-iis#chaining) -->
<!-- SEO | Section 1 | Whitelist -->
<rule name="Whitelist - Resources" stopProcessing="true">
  <match url="^(?:css/|scripts/|images/|install/|config/|umbraco/|umbraco_client/|base/|webresource\.axd|scriptresource\.axd|__browserLink|[^/]*/arterySignalR/.*)" />
  <conditions logicalGrouping="MatchAll" trackAllCaptures="false" />
  <action type="None" />
</rule>
<!-- SEO | Section 2 | Rewrites (chaining) -->
<rule name="SEO - Remove default.aspx" stopProcessing="false">
  <match url="(.*?)/?default\.aspx$" />
  <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
<add input="{HTTP_METHOD}" pattern="GET" />
  </conditions>
  <action type="Rewrite" url="_{R:1}" />
</rule>
<rule name="SEO - Remove trailing slash" stopProcessing="false">
  <match url="(.+)/$" />
  <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
<add input="{HTTP_METHOD}" pattern="GET" />
<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
  </conditions>
  <action type="Rewrite" url="_{R:1}" />
</rule>
<rule name="SEO - Lower case" stopProcessing="false">
  <match url="(.*)" ignoreCase="false" />
  <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
<add input="{HTTP_METHOD}" pattern="GET" />
<add input="{R:1}" pattern="[A-Z]" ignoreCase="false" />
  </conditions>
  <action type="Rewrite" url="_{ToLower:{R:1}}" />
</rule>
<!-- SEO | Section 3 | Redirecting -->
<rule name="SEO - HTTP canonical redirect" stopProcessing="true">
  <match url="^(_*)(.*)" />
  <conditions logicalGrouping="MatchAll" trackAllCaptures="true">
<add input="{HTTP_HOST}" pattern="^www\.(.*)" />
<add input="{HTTP_METHOD}" pattern="GET" />
<add input="{SERVER_PORT}" pattern="80" />
  </conditions>
  <action type="Redirect" url="http://{C:1}/{R:2}" />
</rule>
<rule name="SEO - HTTPS canonical redirect" stopProcessing="true">
  <match url="^(_*)(.*)" />
  <conditions logicalGrouping="MatchAll" trackAllCaptures="true">
<add input="{HTTP_HOST}" pattern="^www\.(.*)" />
<add input="{HTTP_METHOD}" pattern="GET" />
<add input="{SERVER_PORT}" pattern="443" />
  </conditions>
  <action type="Redirect" url="http://{C:1}/{R:2}" />
</rule>
<rule name="SEO - Non-canonical redirect" stopProcessing="true">
  <match url="^(_+)(.*)" />
  <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
<add input="{HTTP_METHOD}" pattern="GET" />
  </conditions>
  <action type="Redirect" url="{R:2}" />
</rule>
<!-- // SEO rules -->

@Ajax.ActionLink("Test",
                 "action",
                 new AjaxOptions { HttpMethod = "POST", 
                                   InsertionMode = InsertionMode.Replace, 
                                   UpdateTargetId = "UserDiv", 
                                   OnSuccess="$.validator.unobtrusive.parse('#my_form_id');"  
                                 }
                )

<script type="text/javascript">
    $.validator.unobtrusive.parse("#my_frm_id");
</script>