usage i.e. String Editor Template... usage ala first comment

BootstrapSupport.cs

  using System;
	using System.Linq.Expressions;
	using System.Web;
	using System.Web.Mvc;

	public static class ControlGroupExtensions
	{
		public static IHtmlString BeginControlGroupFor<T>(this HtmlHelper<T> html,
		                                                  Expression<Func<T, object>> modelProperty)
		{
			var controlGroupWrapper = new TagBuilder("div");
			controlGroupWrapper.AddCssClass("control-group");
			var partialFieldName = ExpressionHelper.GetExpressionText(modelProperty);
			var fullHtmlFieldName = html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(partialFieldName);
			if (!html.ViewData.ModelState.IsValidField(fullHtmlFieldName))
			{
				controlGroupWrapper.AddCssClass("error");
			}
			var openingTag = controlGroupWrapper.ToString(TagRenderMode.StartTag);
			return MvcHtmlString.Create(openingTag);
		}

		public static IHtmlString EndControlGroup(this HtmlHelper html)
		{
			return MvcHtmlString.Create("</div>");
		}
	}

@inherits WebViewPage<string>

@Html.BeginControlGroupFor(x => x)
    @Html.LabelFor(x => x, new { @class = "control-label" })
    <div class="controls">
        @Html.TextBoxFor(x => x, ViewData["htmlAttributes"])
        @Html.ValidationMessageFor(x => x)
    </div>
@Html.EndControlGroup()