sharepoint 2010 an unexpected error has occurred

When We come across this kind of errors ,To know the reason for this error we need to follow the steps.

->Open IIS as Administrator and select web application in which your site is existed
->Right click the web application and select explore
->Now open the web-config file in notepad and type callstack .Set callstack to false if is true else if callstack is true set it as false
->And search for customerror mode and set it to off if it is off else if customerror is off set it as on

"New" Web Application Icon in Disabled Mode

Reason
Not opening the IE in Central admin.

Solution:
Right Click the I.E on below Task bar ->And Right click on Internet Explorer option->Run As Administrator

Getting Blank page instead of Central Admin after installing SharePoint 2010 in Windows 7

Reason:
By default, some of the authentication providers may not be installed in Windows 7 machine (inside IIS). You can check the list of authentication providers by double click on the central administration site in IIS. See the sample screenshot below.

If you double click in the "Authentication" open for central admin when you opened IIS you cannot see the below authentication mechanisms:

1. Windows Authentication
2. Basic Authentication
3. Digest Authentication

Solution:
To add these authentication mechanisms in IIS, open the Command Prompt and type the below command. Then, wait for 2 minutes.

Command

start /w pkgmgr /iu:IIS-WebServerRole;IIS-WebServer;IIS-CommonHttpFeatures;IIS-StaticContent;IIS-DefaultDocument;IIS-DirectoryBrowsing;IIS-HttpErrors;IIS-ApplicationDevelopment;IIS-ASPNET;IIS-NetFxExtensibility;IIS-ISAPIExtensions;IIS-ISAPIFilter;IIS-HealthAndDiagnostics;IIS-HttpLogging;IIS-LoggingLibraries;IIS-RequestMonitor;IIS-HttpTracing;IIS-CustomLogging;IIS-ManagementScriptingTools;IIS-Security;IIS-BasicAuthentication;IIS-WindowsAuthentication;IIS-DigestAuthentication;IIS-RequestFiltering;IIS-Performance;IIS-HttpCompressionStatic;IIS-HttpCompressionDynamic;IIS-WebServerManagementTools;IIS-ManagementConsole;IIS-IIS6ManagementCompatibility;IIS-Metabase;IIS-WMICompatibility;WAS-WindowsActivationService;WAS-ProcessModel;WAS-NetFxEnvironment;WAS-ConfigurationAPI;WCF-HTTP-Activation;WCF-NonHTTP-Activation

Number validation for asp text box:

SharePoint 2010 Bussniess Connectivity Services

Bar Code Integration in SharePoint 2010 Lists

SharePoint Site Anonymous Access

Internet Information Services (IIS) creates the IUSR_computer name account to authenticate anonymous users in response to a request for Web content. The IUSR_computer name account, where computer name is the name of the server that is running IIS, gives the user access to resources anonymously under the context of the IUSR account. You can reset anonymous user access to use any valid Windows account