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The concepts and code examples might not work if you are running Umbraco 8.0 or a later version. If you are using Umbraco 7, this article is perfect for you!
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Create and update entities in Umbraco from code
Using events to modify content or run custom code
Create, submit and handle HTML forms with controllers
Using Tracing and MiniProfiler to debug your code
General advice on source controlling your Umbraco implementation