Happy New Year

Happy Christmas

xap

XAP is the extension for a silver-light based application (Package). This fole contains Compressed assemblies and resources of Silverlight application. xap is generated when the project is built.

view the contents of a .xap file?

rename the extension of the .xap file to .zip. Then view the .zip file using any standard .zip utility.

Access Sql Server database in LAN, Solution for error 1326

Here u need to add a port in fire wall...

go for firewall advance setting.
and here choose inbond rules,
Set new Rule for port.
add port number:1433
Name it "SQL"...

Login failed for user 'IIS APPPOOL\ASP.NET v4.0'.

Open SQL Server Management and
In the object Explorer Expend Login
here you need to add a login named "IIS APPPOOL\ASP.NET v4.0" without inverted Commas.
then in the Login Property provide appropriate role, "I provided System Admin".
and In User mapping option select appropriate databases for that Login...

Blocking Facebook in local network

I m a big fan of mark zuckerberg & i also understand your requirement. So i only can hint u about this. Not full way.
For this u need to set filters on Router.