How can I create a DLL from my project in C# in VS2010

A project has the option "Output type" (in Visual Studio, this is in the first tab of the properties, "Application"). The types are "Windows Application", "Console Application" and "Class Library". DLL is a "Class Library". You can change output type any time.

Note that the difference between type is not very essential. In principle, any application can play a role of the library: it can be added as a reference to any other .NET project. A library can be referenced by other Assembly by its main module (DLL file) using "Add Reference" => "Browse" or given a string name (signed), added to GAC and referenced by its name. In Visual Studio, it is important to setup project dependencies. The most convenient way is to reference a project from the same solution through "Add Reference" => "Projects" tab. In this case, project dependencies are set up automatically. Besides, you can change signature and/or version of referenced assembly at any time (for assembly referenced by its DLL file name a references should be removed and re-added).

Finally, assembly can be loaded dynamically using System.Reflection.Assembly.

—SA

MSDN link here[^] (creating a Dll using the command line).