Closing database connection in asp.net C# razor syntax

Question

Hello Everyone,

 

I have built a website in asp.net C# webpages with razor syntax. I have used WebMatrix. My database is IBM db2.

 

I have two questions.

 

The first question is : 

 

I have opened a database connection where "client" is my connection string and is stored in my web.config file.

var db = Database.Open(client); 

I would like to know how to close this database connection. 

----------------------------- 

 

The second question is :

 

The website extension is .cshtml

What are the requirements for the .cshtml extension that i need in my webserver in order to deploy it ?

For instance, i have these installed :

IIS 7.0
.Net Framework 4.0

I would be grateful if you could help me with some answers. Thanks in advance.