Extracting a project as a separate project from the Visual Studio solution

If by "Extract", you mean "Duplicate" your project and start a new solution with this project, here is what you can do:

1. Create a new solution in Visual Studio
2. Copy your Project folder in the root of the new solution
3. Right click on the solution => Add existing Project and select the project file (*.csproj in this case)

Copy the project folder into separate folder, open the .csproj file, press CTRL + S, it will open the save dialog and you will save the .sln file. That is it.