C# in 6 Hours: From Beginner to Pro!

Explore class and object in object-oriented programming, with an employee class that has salary and bonus, a calculate total pay method, and objects like Alex and Linda as instances.

Demonstrate a box class with length and width and a calculate area method that multiplies them and prints each object's area, using UPS and FedEx as examples of class objects.

Define an employee class with salary and bonus, implement a calculate total pay method, and instantiate objects in a main class to print total pay values.

Define a box class with length, width, and a calculate area method that multiplies them and prints the area; test with UPS and FedEx objects in main.

Translate a table into a C# class and objects by mapping table name to class and columns to properties, with a method to compute total pay as salary plus bonus.

Learn how methods return values in C#, using calculate area to show void versus return, and how a double or int return value is stored and used in totals.

Learn how to pass arguments to methods by supplying local data like length and width, and use this to access class level data for area calculations.

Explore how constructors initialize objects by using the class name as the method, set default values, and support overloaded forms for default or custom length and width.

Explain the three rules of object oriented programming—encapsulation, polymorphism, and inheritance—and compare Java, C++, and C# with C and Visual Basic 6, detailing data hiding, overloading, overriding, and abstract classes.

Explore encapsulation with private salary and bonus and a public set salary method that enforces a 40,000–150,000 range and computes a 20% bonus.

Explore public, private, protected, and internal access modifiers and how visibility spans class, subclass, and project, with private restricting salary and public enabling external access to bonus.

Explore encapsulation and data hiding by using private salary and bonus, public getters, and private setters to control changes while still enabling display of values.

Explore polymorphism through overloading, showing how same method name handles int length, double length, and two parameters. Learn how the language selects the correct method based on passing arguments.

Review 2 reinforces classes as templates and objects as copies with separate data, and explains constructors, encapsulation, inheritance, and polymorphism through overloading.

Build a C# sample project to calculate department budgets by modeling employees and departments with employee and department classes, a default 50,000 budget, and grade-based increments of 150,000 or 100,000.

Learn to build sample C# project with employee and department classes, using private fields and constructors to initialize data and create objects in a main method with a default budget.

Model department and employee relationships in C# by using an employee array and encapsulation, add employees with a method, and adjust budgets based on grade.

Expose employee grade in the department class by applying access modifiers and getter-setter patterns, then add employees, adjust budgets by 150k or 100k based on grade, and handle nulls.

Debug effectively in Visual Studio by using breakpoints, stepping into and over code, and watching variables with add watch and hover to trace method and class execution.

Learn to model code with UML class diagrams by illustrating classes with name, data, and methods, including private, public, and protected modifiers, and depicting associations like department containing employees.

Explore inheritance in C#, showing how a subclass like big box acquires the properties of a box, including area and volume calculations, while private data remains inaccessible.

Explore polymorphism by overriding a base method in a subclass using virtual and override, illustrated with employee tax and vacation logic and a part-time employee’s customized vacation days.

Explain abstract classes and an abstract method in inheritance using square and circle containers that override area of base to compute volume, demonstrating upcasting and memory reuse for polymorphic behavior.

Explains interfaces under inheritance, showing how interfaces with empty methods enforce consistent method naming (new, save, print) across modules like Word and Excel, and how implementing them avoids build errors.

From C# 8.0, interfaces can include default methods to avoid breaking implementations when adding new features, as shown by the insert example.

Demonstrate the base keyword in C# with a square class using a virtual calculate area and a cube class that overrides it, calling base to reuse area and compute volume.

Explore how the static keyword applies to variables, methods, and classes, one per class rather than per object, and how static constructors fire once while instance constructors run per object.

Explore collections in C#, comparing arrays, array lists, and generic lists, and learn how to import System.Collections, add diverse data, use for each loops, and implement string and employee lists.

Learn to store and access data with key-value pairs using hashtable and dictionary. Explore non-generic and generic collections, add, remove, and iterate by keys and values.

Revisit the sample project by using a List<Employee> for department and XYZ company class, override toString, and add objects to MPs to avoid null checks and get the same results.

Review key object-oriented concepts, showing how classes define templates and objects create fresh instances, with constructors and this for initialization, plus encapsulation, polymorphism, inheritance, interfaces, abstract classes, and collections.

Handle errors in C# by using try catch blocks, multiple catch clauses for exceptions, and a finally clause to guarantee cleanup, while accessing exception objects for messages and stack traces.

Throw and propagate exceptions with try catch in a divide numbers example, raising division by zero and sending the message 'please check your numbers' back to the caller.

Explore how implicitly typed variables in C# use the initializer to determine their type, with var as a local, initialized variable that cannot be reassigned to incompatible types.

Learn how language integrated query (LINQ) unifies data access across databases by translating LINQ queries into database-specific SQL, enabling consistent querying of collections and databases.

Master LINQ fundamentals in C# by building queries with from, where, and select, using var and foreach, and applying order by, math sqrt, and aggregates with lazy execution.

Join the employee and salary data using Linq by matching employee id, produce temp objects with name and salary, and print the results; also explore an anonymous type approach.

Explore delegates as pointers to methods, including anonymous methods and lambda expressions, and learn how signatures and return types limit which methods can be pointed to.

Discover anonymous methods by assigning inline code to delegates, avoiding separate classes. These blocks can be passed to other methods and perform x plus y plus five.

Explore lambda expressions as the simplified form of anonymous methods, replacing delegates with concise syntax like x => x * 2 and x, y => x * y.

Explore delegates and anonymous methods in C# by using func, action, and predicate to simplify method pointers, replace declarations, and leverage lambda expressions.

Learn how the sealed keyword stops inheritance and overrides, while constants and read-only fields illustrate compile-time versus runtime initialization with pi and Math.PI.

Learn how extension methods add functionality to existing classes without inheritance by using static classes and the this keyword, demonstrated with double divide and string reverse text.

Learn how partial classes and partial methods extend machine-generated entity framework classes without losing changes, showing how two partial definitions join to form a single class.

Explains pass by value versus pass by reference using a report example and the ref keyword. Demonstrates how passing by reference changes the original variable by sharing the memory location.

Learn to return multiple values from a method using the out keyword, producing the whole number and the fractional part from a single method.

Learn to receive a variable number of arguments in a C# method using the params keyword, handling a string and any number of integers via foreach.

Learn how optional arguments in C# provide default values for parameters, and use named arguments to assign values by parameter name, as shown with alpha, beta, and gamma.

explore how structs differ from classes in c#, with structs as value types that copy on assignment, cannot inherit, lack no-arg constructors, but can implement interfaces and use parameterized constructors.

Master reading and writing files in .NET using stream writer and stream reader, System.IO, and basic error handling for line-by-line file processing.

Conclude the C# course by inviting viewers to leave a recommendation on my YouTube channel and wish them a great day.

Explore generics in C# by comparing non-generic collections with generic lists, and implement generic methods and classes using type parameters T and S, including constraints like where T : employee.