Could not load file or assembly “xxx.dll", PublicKeyToken=null” or one of its dependencies. The system cannot find the file specified in .NET 4.0

After we virtualized a production machine and booted this virtualized machine, .NET reported some errors after re-registering .NET 4.0 on IIS7 these error where resolved, but one WCF service kept on logging the error:

Could not load file or assembly ‘App_Web_squ1ikqu, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null’ or one of its dependencies. The system cannot find the file specified.

Solution

The error was resolved after stopping all application pools in IIS7 and deleting the temporary internet files in the following folders:

C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files

http://www.roelvanlisdonk.nl/?p=2081

The page you are requesting cannot be served because of the extension configuration

Error: The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.

Solution:

In Web.Config;

<system.webServer>

<staticContent>
    <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
    <mimeMap fileExtension=".m4v" mimeType="video/m4v" />
    <mimeMap fileExtension=".ogg" mimeType="video/ogg" />
    <mimeMap fileExtension=".ogv" mimeType="video/ogg" />
    <mimeMap fileExtension=".webm" mimeType="video/webm" />

    <mimeMap fileExtension=".oga" mimeType="audio/ogg" />
    <mimeMap fileExtension=".spx" mimeType="audio/ogg" />

    <mimeMap fileExtension=".svg" mimeType="images/svg+xml" />
    <mimeMap fileExtension=".svgz" mimeType="images/svg+xml" />

    <remove fileExtension=".eot" />
    <mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
    <mimeMap fileExtension=".otf" mimeType="font/otf" />
    <mimeMap fileExtension=".woff" mimeType="font/x-woff" />
</staticContent>

</system.webServer> 

Custom RSS Feed in Sharepoint

http://avinashkt.blogspot.com/2010/03/custom-rss-feed-in-sharepoint.html

SharePoint 2010 Mobile Site Disable

Web.Config

<system.web>
<browserCaps>
 <result type="System.Web.Mobile.MobileCapabilities, System.Web.Mobile, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
 <filter>isMobileDevice=false</filter>
</browserCaps>
</system.web>

SharePoint Backup and Restore

Backup

stsadm -o backup -url http://sharepointsite -filename D:\Backup\backup.bak

Restore

stsadm -o restore -url http://sharepointsite -filename D:\Backup\backup.bak -overwrite

Anonymous Users cannot open XLSX files from a SharePoint document library

$siteUrl = "http://URL_of_your_SITE";
$site = New-Object Microsoft.SharePoint.SPSite($siteurl);
$web = $site.OpenWeb();
 
$enumPerms = [Microsoft.SharePoint.SPBasePermissions];
 
Write-Host $web.AnonymousPermMask64;
$web.AnonymousPermMask64 = $web.AnonymousPermMask64 -bor $enumPerms::OpenItems
$web.Update();
Write-Host $web.AnonymousPermMask64;
 
$web.Dispose();
$site.Dispose();

http://support.microsoft.com/kb/2498047

Unable to add selected web part

ERROR:
Assemblies that implement ASP.NET Web Parts and are installed into a partially trusted location, such as the bin directory, must be compiled with the AllowPartiallyTrustedCallersAttribute set for import to succeed.

SOLUTION:
Add [assembly:AllowPartiallyTrustedCallers] to AssemblyInfo.cs