Challenge 1: A First Top-Level-Statement Program — Possible Solution
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Terminal:

    dotnet new console -o MyApp
    cd MyApp

Program.cs (generated by dotnet new console, then edited):

Console.WriteLine("Hello from my first C# program!");
Console.WriteLine("This file has no class or Main at all.");

Terminal:

    dotnet run

Output:

    Hello from my first C# program!
    This file has no class or Main at all.

Explanation:
dotnet new console scaffolds a minimal project, including a
Program.cs already using top-level statements by default. Two
Console.WriteLine calls print two separate lines, exactly matching
the chapter's own top-level-statement example. dotnet run compiles
and executes the project in one step, the same single-command
convenience the chapter contrasts against Java's separate javac/java
tools.

WHY THIS WORKS AS AN ANSWER
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This uses the exact scaffold-then-run workflow (dotnet new console,
dotnet run) the chapter introduces, with a top-level-statement
Program.cs containing no class or Main, matching the chapter's own
minimal example.