Required Members — Complete Guide

Required Members — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of C# Programming Tutorial on Toolliyo Academy.

8 min read Updated 7/8/2026

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C# Programming Tutorial · Lesson 222 of 239

Raw String Literals

Beginner ✓ → Intermediate ✓ → Advanced ✓ → Professional

Professional · 4 — Architecture & jobs · ~28 min read · Module 16: C# 7 to C# 14 Features

1. Introduction

Professional lesson: Raw String Literals. You will see how large .NET systems are structured. Build understanding one concept at a time — do not rush the architecture modules. Raw String Literals is a core part of C# and .NET development. In plain terms: it helps you adopt new C# language features as teams upgrade to .NET 8/9. You will see Raw String Literals in console apps, Web APIs, background workers, and unit tests. Skipping it makes later modules (OOP, async, collections) much harder.

Read release notes when upgrading SDK — language features often simplify old boilerplate.

2. Real-world story

At Flipkart order processing API, engineers use Raw String Literals to adopt new C# language features as teams upgrade to .NET 8/9. This code shows the same pattern you will see in code reviews — simplified for learning, but structurally similar to production services deployed to Azure or on-prem IIS/Kestrel.

3. Problem without this concept

If you ignore Raw String Literals, this is what teams struggle with:

Wrong types for money → rounding errors in production
Implicit conversions hiding bugs until runtime

4. Definition

Raw String Literals is a core part of C# and .NET development. In plain terms: it helps you adopt new C# language features as teams upgrade to .NET 8/9.

5. Why do we need it?

You will see Raw String Literals in console apps, Web APIs, background workers, and unit tests. Skipping it makes later modules (OOP, async, collections) much harder. When upgrading SDK or reading modern open-source .NET repositories.

6. Where is it used?

Modern open-source .NET repos
SDK upgrade projects
Code review on C# 12+
Teams adopt records and pattern matching when upgrading to C# 11/12.
Nullable reference types prevent NullReferenceException in new code.

7. How it works

Read the example top to bottom.
Each line connects to Raw String Literals.
Run it with dotnet run, then change one value and predict the output before you save.

8. Syntax

Core syntax pattern for Raw String Literals:

int count = 10;
decimal price = 99.50m;
string name = "Ravi";
bool active = true;

Syntax	Meaning
`decimal price = 2499.50m;`	Part of the Raw String Literals example — read with surrounding lines.
`int quantity = 3;`	Part of the Raw String Literals example — read with surrounding lines.
`string sku = "KB-001";`	Part of the Raw String Literals example — read with surrounding lines.
`bool inStock = true;`	Part of the Raw String Literals example — read with surrounding lines.
`Console.WriteLine($"{sku}: ₹{price} x {quantity} = ₹{price * quantity}");`	Prints output to the terminal — useful while learning.
`Console.WriteLine(inStock ? "Available" : "Out of stock");`	Prints output to the terminal — useful while learning.

9. Beginner example

Copy into a console project (dotnet new console → dotnet run).

decimal price = 2499.50m;
int quantity = 3;
string sku = "KB-001";
bool inStock = true;

Console.WriteLine($"{sku}: ₹{price} x {quantity} = ₹{price * quantity}");
Console.WriteLine(inStock ? "Available" : "Out of stock");

Line-by-line

Code	What it means
`decimal price = 2499.50m;`	Part of the Raw String Literals example — read with surrounding lines.
`int quantity = 3;`	Part of the Raw String Literals example — read with surrounding lines.
`string sku = "KB-001";`	Part of the Raw String Literals example — read with surrounding lines.
`bool inStock = true;`	Part of the Raw String Literals example — read with surrounding lines.
`Console.WriteLine($"{sku}: ₹{price} x {quantity} = ₹{price * quantity}");`	Prints output to the terminal — useful while learning.
`Console.WriteLine(inStock ? "Available" : "Out of stock");`	Prints output to the terminal — useful while learning.

10. Real project example

Production-style C#

// Flipkart order processing API
// Uses Raw String Literals to adopt new C# language features as teams upgrade to .NET 8/9
decimal price = 2499.50m;
int quantity = 3;
string sku = "KB-001";
bool inStock = true;

Console.WriteLine($"{sku}: ₹{price} x {quantity} = ₹{price * quantity}");
Console.WriteLine(inStock ? "Available" : "Out of stock");

Why teams use this: Teams that master Raw String Literals ship fewer production incidents and pass code review faster on Flipkart-scale systems.

11. Visual understanding

Input (user, file, API)
        │
        ▼
   Raw String Literals logic in C#
        │
        ▼
   Output (console, HTTP response, file)

12. Internal working

Roslyn compiler checks syntax and types before your program runs.
CLR executes IL and provides services (GC, exceptions, threading).
For this lesson, focus on behavior first — runtime details matter more as apps grow.

13. Advantages

Readable code that new team members can follow
Compiler catches many mistakes before deploy
Huge .NET job market in India and worldwide

14. Disadvantages

Takes time to learn if you skip fundamentals
Overusing advanced features too early adds complexity

15. Best practices

Use meaningful names — `transferAmount` not `x`
Run `dotnet format` or EditorConfig for consistent style
Commit small examples to Git from lesson one

16. Common mistakes

Copy-pasting without typing — your fingers need to remember Raw String Literals syntax.
Skipping error messages when the compiler fails — the red text usually tells you exactly what to fix.

17. Interview questions

What is Raw String Literals in simple words?

Raw String Literals is explained above — focus on the "what" paragraph and the lesson example.

Do I need Raw String Literals for ASP.NET Core jobs?

Yes for most backend roles — this course builds toward Web APIs and services using the same C# fundamentals.

Explain Raw String Literals to a non-technical teammate in 30 seconds.

Focus on the problem it solves — use a bank transfer or shopping cart analogy, not jargon.

Junior interview: give one code example using Raw String Literals.

Use the beginner example from this lesson — be able to write it on a whiteboard without looking.

What goes wrong if you misuse Raw String Literals?

Mention one mistake from the Common mistakes section and how you would fix it in a code review.

Do this on your computer

Open Visual Studio or run dotnet new console -n LearnRawStringLit.
Paste the lesson example into Program.cs (or a new file).
Run the program and confirm the output matches your expectation.
Read the real-world section and name which part of a banking or e-commerce API would use this topic.
Change one line (amount, loop bound, or method name) and run again.
Read the real-world section and identify which layer (API, service, domain) uses this topic.
Run dotnet build and dotnet run locally — confirm output.
Change one value and predict the result before saving.

Experiments — try changing this

Change a number or string in the example and run again — predict output first.
Introduce a deliberate error (remove a semicolon) and read the compiler message.
Open dotnet docs for Raw String Literals and compare one keyword with the lesson example.

18. Summary

Raw String Literals is used to adopt new C# language features as teams upgrade to .NET 8/9.
Practice by editing the example yourself.
Move to the next lesson when you can explain this topic in your own words.

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