Lesson 6: C# setup and .NET foundations: Real-world case study

Concept Explanation

"C# setup and .NET foundations: Real-world case study" turns the basic syntax you have learned into a small but realistic console task. Instead of printing a fixed line, you will format information, make a simple decision, and produce output that feels like part of a real utility. This is useful because beginner code becomes easier to understand when it solves a familiar problem, such as checking whether an order qualifies for free shipping. The lesson focuses on writing clear steps, readable names, and a result that another developer can follow without extra explanation.

Where to Put the Code

1. Define color and position variables at the top.
2. Create shape drawing or placement logic in the middle.
3. Render output (print, canvas, SVG, or styled block) at the end.

Command Reference

• Identify the input values first, then describe the expected message before running the code.
• Change the order total and observe how the conditional output changes.
• Keep the example focused on one realistic rule instead of adding too many branches at once.
• Use descriptive variable names so the purpose of each value is obvious.

Step-by-step Guide

1. Run the example as written and read both output lines carefully.
2. Change the order total to a value below the threshold and compare the result.
3. Explain in one sentence what rule decides whether free shipping is applied.
4. Rename a variable if you can make the intent clearer without changing behavior.
5. End with a quick review: inputs, rule, and final output.

Practice Exercises

• Build a similar example for a discount rule instead of shipping.
• Add a second order total and print the message for both cases.
• Rewrite the output so it is friendly to a real customer-facing console app.

Coding Challenges

• Turn the shipping rule into a small method and compare that version with the inline version.
• Add one extra condition, such as premium membership, without making the code hard to read.

Mini Practice Tasks

• Change one variable name to something more specific.
• Test one order that qualifies and one that does not.
• Write one short line explaining what this mini program does.