ASP.NET MVC fiddle, like jsfiddle, for the people don't like Visual Studio

http://dotnetfiddle.net/CsMvc

C# Safe Navigation Operator: ?.

http://blogs.msdn.com/b/jerrynixon/archive/2014/02/26/at-last-c-is-getting-sometimes-called-the-safe-navigation-operator.aspx

var g1 = parent.child.child.child;
Problem happens if any child is null.

New operator solves this problem
var g1 = parent?.child?.child?.child; 
if (g1 != null) // TODO

How to solve problem: 'xEntities': type used in a using statement must be implicitly convertible to 'System.IDisposable' when use using block to open Entity Framework data context?

Need to add EntityFramework.dll reference into your project file.

What is Open ID and its workflow?

OpenID allows you to use an existing account to sign in to multiple websites, without needing to create new passwords.
From:  http://openid.net/get-an-openid/what-is-openid/

OpenID 2.0 interaction sequence from Google
https://developers.google.com/accounts/docs/OpenID?csw=1#Interaction

How to avoid html tags flashing with Knockout data binding in the beginning?

Make a div to wrap up all of KO data binding elements, and make it invisible and only turn visible after KO data binding.

KO data binding tags in here ..

How to add Bundling function into upgraded ASP.NET MVC 4 project?

1. Use nuget to add reference for System.Web.Optimization
Install-Package Microsoft.AspNet.Web.Optimization
2. Add following call into Application_Start event
 BundleConfig.RegisterBundles(BundleTable.Bundles);
3. Define your bundle
        public static void RegisterBundles(BundleCollection bundles)
        {
        bundles.Add(new ScriptBundle("~/Scripts/jquery").Include(
            "~/Scripts/Lib/jquery/jquery-{version}.js",
            "~/Scripts/Lib/jquery/jquery.*",
            "~/Scripts/Lib/jquery/jquery-ui-{version}.js")
        );
        }

Languages ranking from 2013 Stack Overflow User Survey Results

http://blog.stackoverflow.com/2014/02/2013-stack-overflow-user-survey-results/

Great Algorithms that Revolutionized Computing

http://en.docsity.com/news/interesting-facts/great-algorithms-revolutionized-computing/

do you really know JavaScript?

http://javascript-puzzlers.herokuapp.com/?utm_source=ourjs.com

Detailed ASP.NET MVC Pipeline

http://www.dotnet-tricks.com/Tutorial/mvc/LYHK270114-Detailed-ASP.NET-MVC-Pipeline.html

How to solve problem, The length of the query string for this request exceeds the configured maxQueryStringLength value in ASP.NET?

Add following sections into web.config
  <system.web>
    <httpRuntime maxUrlLength="10000" maxQueryStringLength="2000000" />

And also in
  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxUrl="10000" maxQueryString="2000000" />
      </requestFiltering>
    </security>

How to add prefix string in Knockout data binding?

ID is a observable
<h2 data-bind="text:'Transaction ID:'+ID()"></h2>

How to fix Access denies problem while run ASP.NET MVC project with Windows Authentication in Visual Studio 2012

Open project file with notepad
 Change
<IISExpressWindowsAuthentication>disabled</IISExpressWindowsAuthentication>
To
<IISExpressWindowsAuthentication>enabled</IISExpressWindowsAuthentication>
The full error is:
Access is denied.
Description: An error occurred while accessing the resources required to serve this request. The server may not be configured for access to the requested URL.
Error message 401.2.: Unauthorized: Logon failed due to server configuration. Verify that you have permission to view this directory or page based on the credentials you supplied and the authentication methods enabled on the Web server. Contact the Web server’s administrator for additional assistance.

How Many Software Developers Are Out There?

18 millions
http://www.infoq.com/news/2014/01/IDC-software-developers

How to install ASP.NET MVC 5 on Visual Studio 2012

https://www.microsoft.com/web/handlers/webpi.ashx/getinstaller/WebNode11Pack.appids

http://blogs.msdn.com/b/webdev/archive/2013/11/18/announcing-release-of-asp-net-and-web-tools-2013-1-for-visual-studio-2012.aspx?PageIndex=2#comments

How to find a Shelveset in Visual Studio 2013?

DO NOT know why Microsoft changes menu name/location around.

File->Source Control->Find Shelveset

SQL join explained in diagram

http://i.imgur.com/1m55Wqo.jpg

Dabblet is an interactive playground for quickly testing snippets of CSS and HTML code

http://dabblet.com/

8 Visual Studio debugging tips – debug like a boss

http://damieng.com/blog/2014/02/05/8-visual-studio-debugging-tips-debug-like-a-boss

How to wrap up a static html page into ASP.NET MVC Action?

Without layout, it is very easy

public ActionResult PrivacyPolicy()
        {
            //return View();
            return Content(System.IO.File.ReadAllText(Server.MapPath("~/privacypolicy.html")));
        }

With layout
In Controller

public ActionResult PrivacyPolicy()
        {
            return View();
        }

In view file
@Html.Raw(File.ReadAllText(Server.MapPath("~/privacypolicy.html")))

What is OR operator in CSS selector?

Comma:

h1, h2, h3 { font-family: sans-serif }

In W3 calls grouping
http://www.w3.org/TR/CSS2/selector.html#grouping

How to get visitor IP address in static method?

        protected static string GetUserIPAddress()
        {
            string VisitorsIPAddr = string.Empty;
            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
            {
                VisitorsIPAddr = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
            }
            else if (System.Web.HttpContext.Current.Request.UserHostAddress.Length != 0)
            {
                VisitorsIPAddr = System.Web.HttpContext.Current.Request.UserHostAddress;
            }
            return VisitorsIPAddr;
        }