How to create software solutions with multiple projects?

I want to create a solution with several projects.

I think I have three options:

• Envdte
• Microsoft.Build
• Manually create the * .sln and * .csproj files.

I googled, but did not find good examples for options 1 and 2 (I mean how to create solutions, add projects, add referees, add new or existing project elements, etc.)

The third option, I think, is simpler, but if there are good options, I do not need to create projects manually.

So my questions are:

Are there any other options for creating projects programmatically?

and which option is better?

Thank.