How to solve "This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false". "

When deploy a website on IIS Server first time, get following 500 internal server error:
This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".

The first thing to do is to run
turn on/off Windows features:

So can check if related features are enabled on the server

How to enable html source button on tinyMCE?

Add "code" into plugins list, then add "code" into button array

        tinyMCE.init({
            // General options
            mode: "textareas",
            plugins: "spellchecker,code",
            theme : "advanced",
            theme_advanced_buttons1 : "bold,italic,underline,separator,strikethrough,justifyleft,justifycenter,justifyright,justifyfull,bullist,numlist,undo,redo,link,unlink,code",
            theme_advanced_buttons2 : "code",
        });

Weinre with Browserstack

http://arafat.azurewebsites.net/2013/11/16/weinre-on-azure-in-combination-with-browserstack/

Core algorithms deployed

http://cstheory.stackexchange.com/questions/19759/core-algorithms-deployed/19773#19773

How to implement minimum string length validation by Data annotation in ASP.NET MVC?

Two ways:

Fisrt:

        [StringLength(50, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 10)]

 

Second:

Regular expression

[RegularExpression(@"^.{10,}$", ErrorMessage = "Minimum 10 characters required")]