You find the resources in the class
Resources
. Given the top-level namespace of your project is called "MyProject", you find the default Resources-class under the namespace
MyProject.Properties
, e.g.:
Bitmap image1 = MyProject.Properties.Resources.Image1;
Depending on the type of resource the members of the Resources-class also have different types: String, Bitmap, Icon, byte[], etc.
You can take a look at it by navigating to the definition of the Resources-class or by opening the file "Resources.Designer.cs" from: Solution Explorer -> YourProject -> Properties -> Resources.resx.
If you add custom resource-files (via Add -> New Item -> Resources File) they can have custom names and can be located under custom namespaces.