Build Real C# Applications from First Principles to Production
Learn C# and the .NET ecosystem hands-on — from variables and control flow through OOP, databases, and a complete capstone project.
This course takes you from writing your first line of C# to building a SQLite-backed inventory management system you can publish to GitHub. Along the way, you develop the problem-solving instincts and code organization habits that professional C# developers rely on every day.
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What you'll gain
You will write functional programs at every stage of the course, not just follow along with theory. Each module builds directly toward applications you can run, test, and share.
You will design class hierarchies, work with collections and LINQ, query a SQLite database using ADO.NET, and read and write persistent file storage — skills that appear in nearly every professional C# codebase.
The final modules guide you through building, testing, refactoring, and publishing a complete application to GitHub with a professional README, giving you a concrete artifact to show employers or clients.
Who this course is for
You understand basic programming concepts but have limited experience with a statically typed, object-oriented language in a professional ecosystem. This course gives you hands-on C# experience and a working .NET project to supplement your academic work.
You already write code in another language — Python, JavaScript, or Java — and want to add C# to your skill set without sitting through content built for absolute beginners. The course moves efficiently through fundamentals and spends significant time on OOP, collections, and database access where .NET development happens in practice.
You work in a technical role — QA, data analysis, IT administration — and want to build real software skills rather than finish a tutorial and hit a wall. This course gives you the structure, vocabulary, and hands-on practice to write and maintain C# applications independently.
What you'll learn
The course opens with the C# language fundamentals and .NET environment setup, then moves systematically through control flow, methods, and data structures before introducing object-oriented programming across two dedicated modules. From there, you work with collections, LINQ, exception handling, file I/O, and ADO.NET database access — each topic building on the last. The final modules cover project architecture, unit testing, version control with Git, and professional best practices, culminating in a capstone project that ties every skill together into a deployable application.
Module 1
C# Fundamentals and the .NET Ecosystem
4 lessons
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Module 2
Control Flow
3 lessons
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Module 3
Methods and Code Organization
3 lessons
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Module 4
Arrays and Strings
3 lessons
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Module 5
Object-Oriented Programming Basics
3 lessons
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Module 6
OOP Intermediate
3 lessons
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Module 7
Collections and LINQ
3 lessons
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Module 8
Exception Handling and Debugging
3 lessons
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Module 9
File I/O and Data Persistence
3 lessons
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Module 10
Database Access with ADO.NET
3 lessons
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Module 11
Namespaces, NuGet, and Testing
3 lessons
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Module 12
Building Real-World Projects
3 lessons
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Module 13
Professional Development and Next Steps
3 lessons
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Learn by doing
Each module includes a hands-on lab that produces a working C# program — not a snippet, but a complete, runnable application. You will use Visual Studio or VS Code, the dotnet CLI, GDB-compatible debugging tools, and the Microsoft.Data.Sqlite NuGet package to work the way professional .NET developers do.
- Write a C# console application that prompts the user for height and weight, calculates BMI, and displays the result with a weight category
- Implement input validation using conditionals and exception handling to reject invalid entries without crashing
- Build an interactive number guessing game using loops, conditionals, and the Random class that gives the player hints and tracks attempts
- Add input validation to reject non-numeric entries and out-of-range guesses, keeping the loop running until valid input is provided
- Create a set of well-documented static methods that convert between Celsius, Fahrenheit, and Kelvin, each with clear parameters and return values
- Write a menu-driven driver program that calls the library methods, demonstrating proper method design, overloading, and XML doc comments
- Build a program that reads a block of text and reports word count, character count, most frequent words, and sentence count using arrays and String methods
- Use StringBuilder and string interpolation to display a clean, readable summary report of the analysis results
- Design and implement a BankAccount class with private fields exposed through properties for balance and owner, and methods for deposit, withdrawal, and transfer
- Override ToString() to produce meaningful output and use encapsulation to prevent invalid balance changes from outside the class
- Design an abstract Shape class (or interface) with concrete subclasses like Circle, Rectangle, and Triangle that each implement area and perimeter calculations
- Write a driver program that stores different shapes in a single collection and calls their methods polymorphically, demonstrating dynamic dispatch
- Build a grade tracker using a Dictionary of student names mapped to lists of scores, supporting add, update, and average calculation operations
- Use LINQ queries to identify top-performing students and sort students by average grade
- Build a four-function calculator that uses try/catch blocks to handle division by zero, invalid input, and unexpected errors without crashing
- Implement a custom exception class for out-of-range inputs and use finally to ensure cleanup actions always run regardless of errors
- Create a contact manager that saves and loads contacts to a CSV file, supporting add, search, and delete operations that persist between program runs
- Use the using statement and proper file path handling to safely read and write data, demonstrating real-world file I/O patterns
- Connect to a SQLite database using ADO.NET and the Microsoft.Data.Sqlite NuGet package, creating a tasks table if it does not already exist
- Implement add, complete, delete, and list operations using parameterized commands, with all database resources managed via using statements
- Extend the SQLite-backed application with a reporting feature that runs aggregate SQL queries (COUNT, SUM, GROUP BY) and displays formatted summary output
- Use reader schema information to dynamically read column names and types, producing a generic query-and-print utility method that works across different result sets
- Organize a utility application across multiple namespaces — a math helper, a string helper, and a main driver — demonstrating namespace structure and project layout
- Write xUnit test classes for at least two utility methods, verifying correct behavior and edge cases using assertions
- Build a complete inventory management system backed by SQLite via ADO.NET that records items, tracks stock levels, and supports adding, updating, and removing inventory
- Apply planning, modular class design, and refactoring techniques to produce a clean, well-structured application that integrates OOP, collections, LINQ, exceptions, file/database I/O, and testing from across the course
- Initialize a Git repository for your Inventory Management System, write a professional README following C# conventions, and push the project to a public GitHub repository
- Identify two C#/.NET career paths of interest and outline a 90-day learning plan with specific resources, projects, and milestones for continued growth
Destin Learning
Destin Learning creates practical, project-driven courses for developers, IT professionals, and tech enthusiasts who want to build real skills — not just pass a certification exam.
Every course is built around hands-on labs, working code, and real-world tools. Our students learn by doing: writing programs, configuring systems, and solving problems in environments that mirror what they'll encounter on the job.
Our courses cover systems programming, Linux administration, cloud infrastructure, AI and machine learning, and foundational computer science — all taught with the same philosophy: understand it deeply, build it yourself, and know why it works.
Destin Learning · destinlearning.com
Start Building with C# Today
Contact us for pricing and get lifetime access to self-paced video lessons, hands-on labs, and a guided capstone project.
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