Network Programming in .NET

The UK electoral roll is a database of millions of UK citizens, which comprises the name, address and phone number of every person registered to vote in the UK.

This API, at http://www.electoralrollapi.com integrates with data held by the UK government, and can be used for purposes such as direct mail marketing, debtor searches, and demographic data.

Access to the API costs as little as 1p per request, and you can get a free account with 10 requests free, by emailing info@electoralrollapi.com

The API is an XML / SOAP based web service, that integrates easily into C#, ASP.NET, PHP and Java applications.