This blog post makes it easy for you to set up Google reCAPTCHA on your MVC website. It also works with Umbraco.
In case you are looking for a regex to find a number greater than 1200 or something similar, I though I would post it so you can alter it for your needs.
This post shows you how to create your own custom validation attributes in MVC.
You can then decorate your model properties with them on your forms.
This post shows you how you can do client side, unobtrusive validation on your MVC form.
It assumes you have already set up your Model, View and Controller, but you just need to know how to get it to validate on the client side.
This post gives you some examples of how you can check for errors when retrieving web.config app setting values.
This post shows you how to create an XML sitemap in your Umbraco website.
I will share the code I have used to create my XML sitemap page http://www.codeshare.co.uk/xmlsitemap
You will need an XML sitemap when you submit your site to search engines.
If, like me, you find it very annoying that Umbraco seems to stop you from entering whatever markup you want to put in the editor, then this post should help you.
If you want to be able to generate random and realistic data for your program, there is a fantastic free resource called Mockaroo.