Is it possible to only have one file instead of a whole folder?

Instead of having a folder for each project in C#, and many files, is it possible to just have one file for each project? I am making console application (.NET Core), and it is annoying to have about 8 files when I am syncing across two computers, and it would be easier to just have a single file, per project. I am used to Python where one file is enough, and that's nice. A whole folder filled with files that are almost the same each time is just annoying to me. I am using VS Community 2019 if that matters.

Edit: I formulated myself in a very bad way, which meant I didn't get the answer I was looking for.

Solution 1:

There's absolutely nothing preventing you from having multiple classes in a single file.

namespace Hello
{
    public Class A
    {
    }

    public Class B
    {
    }
}