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    copied!<p>I dummied down the method to this: </p> <pre><code>@helper RenderConnectButton(System.Web.Mvc.HtmlHelper helper, ContactTwitterHandleDto contactTwitterHandle, ContactFacebookAccountDto contactFacebookAccount) { &lt;ul class="socialMedia inlineList"&gt; @if (contactTwitterHandle != null &amp;&amp; contactTwitterHandle.IsValid.HasValue &amp;&amp; contactTwitterHandle.IsValid.Value) { var tHandle = contactTwitterHandle.Handle; &lt;li class="twitter"&gt; &lt;a class="btn" href="http://twitter.com/@tHandle" target="_blank"&gt; &lt;i&gt;&lt;/i&gt; &lt;span class="label"&gt;@tHandle&lt;/span&gt; &lt;/a&gt; &lt;/li&gt; } &lt;/ul&gt; } </code></pre> <p>If I remove @tHandle from the line: </p> <pre><code> &lt;a class="btn" href="http://twitter.com/@tHandle" target="_blank"&gt; </code></pre> <p>It will parse fine. If I put the Url above in a variable, then I get the error.</p> <p><strong>It's failing when trying to parse a string that is a Url.</strong></p> <p>Stack trace:</p> <pre><code> at System.Web.WebPages.HelperPage.WriteAttributeTo(TextWriter writer, String name, PositionTagged`1 prefix, PositionTagged`1 suffix, AttributeValue[] values) at ASP.MvcSocialMediaHelpers.&lt;&gt;c__DisplayClass1.&lt;RenderConnectButton&gt;b__0(TextWriter __razor_helper_writer) in c:\OberonScrum\Branches\RazorUpgrade\Source\Web\App_Code\MvcSocialMediaHelpers.cshtml:line 83 at System.Web.WebPages.HelperResult.ToString() at System.String.Concat(Object arg0, Object arg1) at ASP.views_contact_detail_aspx.__RenderMainContent(HtmlTextWriter __w, Control parameterContainer) in c:\OberonScrum\Branches\RazorUpgrade\Source\Web\Views\Contact\Detail.aspx:line 13 at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at ASP.views_shared_twocolumnleftmain_master.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\OberonScrum\Branches\RazorUpgrade\Source\Web\Views\Shared\TwoColumnLeftMain.Master:line 109 at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) </code></pre> <p>[UPDATE] Tried working around the issue using TagBuilder and rendering with Html.Raw(); got the same result.</p> <pre><code>@helper RenderConnectButton(System.Web.Mvc.HtmlHelper helper, ContactTwitterHandleDto contactTwitterHandle, ContactFacebookAccountDto contactFacebookAccount) { &lt;ul class="socialMedia inlineList"&gt; @if (contactTwitterHandle != null &amp;&amp; contactTwitterHandle.IsValid.HasValue &amp;&amp; contactTwitterHandle.IsValid.Value) { var tHandle = contactTwitterHandle.Handle; var a = new TagBuilder("a"); a.Attributes.Add("href", "http://twitter.com/" + @tHandle); a.Attributes.Add("target", "_blank"); a.Attributes.Add("class", "btn"); a.InnerHtml = string.Format("&lt;i&gt;&lt;/i&gt;&lt;span class=\"label\"&gt;{0}&lt;/span&gt;", @tHandle); &lt;li class="twitter"&gt; @Html.Raw(a.ToString()) &lt;/li&gt; } &lt;/ul&gt; } </code></pre>
 

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