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I have two projects within a single solution in Visual Studio 2010. These projects are called Project1 and Project2. Within these projects, two namespaces are defined, Namespace1 and Namespace2, respectively.

Inside some code within Namespace2, I'd like to use some structs, classes, etc. which I've defined in Namespace1. Is there any way to do this?

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Yes, add a reference to Project1 from Project2. Right-click the project, choose "Add References" then from the "Projects" tab, choose Project1.









Set Project Build Order in Visual Studio

In order to set the Build order for your Solution, right-click on the Solution in Solution Explorer and Select Project Build Order:

Your Project Dependencies should be set correctly which is used to determine the Build order by Visual Studio.

The image below shows the Project references added in the Business layer to determine that the DTO and Persistence Projects should be built first before the Business layer Project.

The Project Build order will make sure the required dlls are available for the Api to compile correctly.