Helper Example

gistfile1.cshtml

@functions
{
    public static HelperResult ValidatedElementFor<TModel, TProperty>(HtmlHelper<TModel> html, Expression<Func<TModel, TProperty>> expr, object editorHtmlAttributes = null)
    {
        var defaultHtmlAttributes = new { @class = "form-control" };
        var combinedHtmlAttributes = html.MergeHtmlAttributes(defaultHtmlAttributes, editorHtmlAttributes);
        return ValidatedElement(html.ValidationErrorFor(expr, " has-error", " has-success"), html.LabelFor(expr, htmlAttributes: new { @class = "control-label col-sm-3" }), html.EditorFor(expr,  new { htmlAttributes= combinedHtmlAttributes}), html.ValidationMessageFor(expr, "", new { @class = "text-danger" }));
    }
}
@helper ValidatedElement(MvcHtmlString error, MvcHtmlString label, MvcHtmlString editor, MvcHtmlString message)
{
    <div class="form-group has-feedback@(error)">
        @label
        <div class="col-sm-9">
            @editor
            <span class="glyphicon glyphicon-ok form-control-feedback" aria-hidden="true"></span>
            <span class="glyphicon glyphicon-info-sign form-control-feedback" aria-hidden="true"></span>
            <span class="glyphicon glyphicon-remove form-control-feedback" aria-hidden="true"></span>
            @message
        </div>
    </div>
}