If you are using the nowadays standard implementation of presenting values for your web solution in Umbraco, e.g. Models Builder and you don't seem to get the IntelliSense to work when trying to retrieve your properties - then here is how to enable it.
Go to the App_Data folder in the project in Visual Studio and collapse the content and head into the Models catalog - make sure you also have toggled the Show All Files option in Visual Studio. Right click the models.generated.cs class and include it in the project.
This will provide the IntelliSense with the information needed for retrieving values.