change the name of output dll

In a C++ dll project using VS 2019 the option can be found in Project > Properties > Linker > General > Output File. Found answer in this question.

Depending on which version of Visual Studio.NET you are running, try going to Project Properties -> Application, and then change the Assembly Name field. On earlier versions it might be in a different place but I think the Assembly Name field is still the one you are looking for.

In Visual Studio 2017, change the "Target Name" under Project Properties-> Configuration Properties-> General.