I need to change my css and html from visual view of site page, as in chrome developer tools.

So basically just something like Bootstrap from Twitter. A collection of CSS (preferably LESS) and JS to create a GUI in the style of the Metro GUI on the desktop/mobile. A lot of Microsoft website already embrace the Metro-style, but there is no uniform standard or library available for others who would like to create a Metro-website. I think this is a very good chance for Microsoft.

The problem with the development with MVC is that we are used to ASP.net design view and drag and drop. If this is there is MVC it would be very easy.

Store/read/initialize data as a tree (Entity Fr.), convert trees to JSON.
View Symfony 1.4 with doctrine nested set, and fixtures.

In default ASP.NET MVC 4 project, If set "BundleTable.EnableOptimizations = True" in Global.asax, Or <compilation debug="false" targetFramework="4.5" />,

When call @Styles.Render() or @Scripts.Render() function，will run Bundling and Minification function together.

Can let we choice just use "Bundling" or "Minification" function, Example: In BundleConfig.vb(or .cs)

bundles.Add(New StyleBundle("~/Content/themes/base/css").Include(
"~/Content/themes/base/jquery.ui.core.css",
"~/Content/themes/base/jquery.ui.resizable.css",
...))

If I just choice Bundling, output non-Minification file.
It URL same like "/Content/themes/base/css?v=uisoij234...", but content not-Minification.

If I just choice Minification, output non-Bundling file.
It URL same like
"/Content/themes/base/jquery.ui.core.min.css"
"/Content/themes/base/jquery.ui.resizable.min.css"
...
just minification and add "min" to file.

At compile time, verify routes map to controller methods and issue compilation errors for unmapped routes. Issue warnings for controller methods and parameters are wired up in routing. This should also have the side benefit of making the UrlHelper more reliable.

I need preview for my html markup

We need a HTML5 placeholder element - this could be defined in the viewmodel or even in the EditorFor tag.

Extending the DropDownList to show the items grouped by a category

<select>
<option value="">[Please select an option]</option>
<optgroup label="Group 1">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
</optgroup>
<optgroup label="Group 2">
<option value="3">Option 3</option>
<option value="4">Option 4</option>
</optgroup>
<optgroup label="Group 3">
<option value="5">Option 5</option>
<option value="6">Option 6</option>
</optgroup>
<optgroup label="Group 4">
<option value="7">Option 7</option>
<option value="8">Option 8</option>
</optgroup>
</select>

http://weblogs.asp.net/raduenuca/archive/2011/02/26/asp-net-mvc-extending-the-dropdownlist-to-show-the-items-grouped-by-a-category.aspx

Index.cshtml should include an example showing how to use jQuery, because it is now loaded at the end of the document. This results in "$ not defined" error.

_Layout.cshtml:
@Scripts.Render("~/bundles/jquery")
@RenderSection("scripts", required: false)

@section scripts
{

<script type="text/javascript">
$(document).ready(function () {
//something here
});
</script>

}

I know the MVC3 futures dll Microsoft.Web.MVC has Html.Serialize. But if I'm building an app using mvc4 do I still need to install mvc3 futures?
why is is not available in mvc4?

From the H5BP site (http://html5boilerplate.com/):

HTML5 Boilerplate is the professional frontend developers's base HTML/CSS/JS template for a fast, robust and future-safe site.
Boilerplate is not a framework, nor does it prescribe any philosophy of development, it's just got some tricks to get your project off the ground quickly and right-footed.

They also have a selection of server configs (web.config) to enable caching and other goodies.

https://github.com/h5bp/server-configs

Actually i can do this:

[OutputCache(Duration = 60, VaryByParam = "id")]
public ActionResult Index(string id)
...

think that could be interesting to have a way to specify a cache dependency to a file or maybe other objects..

for example:

[OutputCache(Duration = 60, VaryByParam = "id", Dependency("~/FileXpto.txt"))]
public ActionResult Index(string id)
...

It would be very handy to make a css change in visual studio and then have VS compute which mvc views will be affected by the change. The summary of results (views affected) could be displayed in a list/window which the user can click on one line at a time to go see the effected ui in the .cshtml file and the rendered view

At present the Web API Method can be accessed using URI,
It would be nice if the Web API can be exposed using a WSDL /2, which could be referred in the project.

It would be great if razor views could support generic models.

@model MyViewModel<T>

Provide the ability to easily deploy/publish ASP.Net MVC applications as Web Parts or Web Part Pages in SharePoint.

That would be nice to introduce something like "MVC debugging mode" to ASP.NET MVP project. In this mode developer will see some extended details about MVC application state like routes table and so on.

To understand better what I mean - please look at these 2 posts:

RouteDebugger 2.0 - http://haacked.com/archive/2011/04/13/routedebugger-2.aspx

ASP.NET Routing Debugger - http://haacked.com/archive/2008/03/13/url-routing-debugger.aspx