Provides a standard input control for forms on Bootstrap, along with inline validation messages and highlighting.

BootstrapHtmlHelper.cs

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Web.Mvc;
using System.Web.Mvc.Html;
 
public static class BootstrapHtmlHelper
{
	public static MvcHtmlString BootstrapInputFor<TModel, TProp>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProp>> expr, string name)
	{
		var controlName = ExpressionHelper.GetExpressionText(expr);
		var errorMessage = "";
		if (helper.ViewData.ModelState.ContainsKey(controlName))
		{
			var errors = helper.ViewData.ModelState[controlName].Errors;
			if (errors != null && errors.Count > 0) errorMessage = errors[0].ErrorMessage;
		}
 
		var classes = "control-group";
		if (!string.IsNullOrWhiteSpace(errorMessage)) classes += " error";
			return new MvcHtmlString(string.Format(@"
				<div class=""{0}"">
					{1}
					<div class=""controls"">
						{2}
						<span class=""help-inline"">{3}</span>
					</div>
				</div>	
		", 
		 classes, 
		 helper.LabelFor(expr, name, new Dictionary<string, object> {{"class","control-label"}}), 
		 helper.TextBoxFor(expr), 
		 errorMessage));
	}
}