These are just a few steps, as the latest reCAPTCHA library has all the pieces you need for asp.net MVC:

Step 1 – Create Your ReCAPTCHA Account
Go to the ReCAPTCHA site and sign up for your keys. You will get a private key and and a public key.

Step 2 – Download the .Net Library for ReCAPTCHA
Get reCAPTCHA Library and add this to your ASP.NET MVC project as a reference.
Step 3 – Create Action Filter and handle the Captcha validation
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Linq IN query will pull back a set of results from SQL that is within a given range. This range can be set manually, or can itself be a query. So if you have an eCommerce application and you want to know what products you have in a given user’s cart

SQL

SELECT * FROM Product WHERE ProductID IN (SELECT ProductID FROM mycart)

Linq

List<int> itemQuery = new List<int>() {1,2,3,4};

var myProducts = from p in db.Products
                where itemQuery.Contains(p.ProductID)
                select p;

Linq To Sql only constructs the query when the Enumerator is tripped

This article recently which I thought was pretty cool. It describes how to build and use an ASP.NET Server Control that makes Google Map integration easy within ASP.NET applications: