
Delve into .NET development with C#, covering programming fundamentals, object-oriented principles, exception handling, and multithreading. Gain hands-on experience to build cross-platform applications effectively.

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.NET is Microsoft’s free and open source framework for developing native software applications on Linux, macOS, and Windows. The power of cross-platform development allows developers to design, code, and run programs on a wide array of platforms.

This course is an introduction to developing .NET applications using C#. You’ll start start with a comprehensive review of C# and computer programming fundamentals: data types, conditionals, loops, methods, and more. You’ll then review the basics of object-oriented programming before diving into methods, exception handling, delegation, and events. With this foundation, you’ll continue building interfaces, collections, database operations, and multithreading. You’ll wrap up with process improvements using dynamic binding, garbage collection, and unmanaged resources.

By the end of this course, you’ll have hands-on experience with C# and .NET, and be ready to build applications using object-oriented programming principles on almost any platform.

Mastering C# and .NET

## Introduction

We occasionally need to perform some mathematical calculations inside our programs. We may even want to create our own calculator. .NET provides us with the necessary tools out of the box.

The `System` namespace contains a static class called `Math` with  methods for performing various mathematical operations.

For instance, we could obtain the square root of a number by simply calling the `Math.Sqrt()` method.

> **Note:** he `Math` class is static, so all its members are also static. We use the class’ methods without instantiating it.

The `Math` class includes many methods, so it’s impossible to cover them all. We’ll see some of them in our examples, though. Here are some of the most popular:
- `Math.Pow()`: This raises a number to a given power.
- `Math.Sqrt()`: This finds the square root of a number.
- `Math.Cos()`: This calculates the cosine of a given angle.
- `Math.Abs()`: This returns the absolute value of a number.
- `Math.Cbrt()`: This calculates the cubic root of a number.

## Examples

Let’s create some useful programs as examples.

### Calculate the area of a circle

Here’s the formula:

$$A = \pi r^2$$

 Our method accepts `radius` as a parameter. We take its square and multiply the result by $\pi$. Fortunately, the `Math` class has a constant called `PI` that holds the value of $\pi$:  

# Introduction

We occasionally need to perform some mathematical calculations inside our programs. We may even want to create our own calculator. .NET provides us with the necessary tools out of the box.

The `System` namespace contains a static class called `Math` with  methods for performing various mathematical operations.

For instance, we could obtain the square root of a number by simply calling the `Math.Sqrt()` method.

> **Note:** he `Math` class is static, so all its members are also static. We use the class’ methods without instantiating it.

The `Math` class includes many methods, so it’s impossible to cover them all. We’ll see some of them in our examples, though. Here are some of the most popular:
- `Math.Pow()`: This raises a number to a given power.
- `Math.Sqrt()`: This finds the square root of a number.
- `Math.Cos()`: This calculates the cosine of a given angle.
- `Math.Abs()`: This returns the absolute value of a number.
- `Math.Cbrt()`: This calculates the cubic root of a number.

# Examples

Let’s create some useful programs as examples.

## Calculate the area of a circle

Here’s the formula:

$$A = \pi r^2$$

 Our method accepts `radius` as a parameter. We take its square and multiply the result by $\pi$. Fortunately, the `Math` class has a constant called `PI` that holds the value of $\pi$:  

Use the Math class to perform mathematical calculations.

Getting Started

C# Programming Basics

Classes and OOP

Classes and OOP II

Exception Handling

First Assessment

Delegates and Events

Interfaces

Additional Features

Collections

LINQ

Working with Strings

Working with Dates and Time

Multithreading and Asynchronous Programming

Reflection

Dynamic Binding

Garbage Collection and Unmanaged Resources

Final Assessment

Next Steps

Appendix

Math Class

Introduction