
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

When trying to store an object of one type in a variable of another type, an implicit cast may take place. In other circumstances, we must cast an object explicitly:

```C#
int number = 14;
short secondNumber = (short)number; // Explicit cast due to shrinking
int anotherNumber = secondNumber; // Implicit cast due to expansion
```

It would be ideal if we could control the specificity of this casting for our user-defined types. Cast operator overloading lets us control the exact process of type casting. We can overload both implicit and explicit casts.

## Custom behavior for implicit casts

Here’s the syntax for overloading the implicit cast operator:


```C#
// When Source_Type is implicitly cast into Return_Type
public static implicit operator Return_Type(Source_Type parameter)
{
}
```

We use the keywords, `implicit operator`, followed by a return type (the target type our object is cast into). We can have different cast operator overloads for different target types.

To clarify, let’s create a sample class and overload its implicit cast operator:


```C#
class BankAccount
{
	public decimal Funds { get; set; }
}
```

Our class has a single property that represents the amount of money in the bank account. We want the `BankAccount` object to be able to cast to `decimal`. To enable that, we create an overload that implicitly casts our `BankAccount` object to `decimal`:

# Introduction

When trying to store an object of one type in a variable of another type, an implicit cast may take place. In other circumstances, we must cast an object explicitly:

```C#
int number = 14;
short secondNumber = (short)number; // Explicit cast due to shrinking
int anotherNumber = secondNumber; // Implicit cast due to expansion
```

It would be ideal if we could control the specificity of this casting for our user-defined types. Cast operator overloading lets us control the exact process of type casting. We can overload both implicit and explicit casts.

# Custom behavior for implicit casts

Here’s the syntax for overloading the implicit cast operator:


```C#
// When Source_Type is implicitly cast into Return_Type
public static implicit operator Return_Type(Source_Type parameter)
{
}
```

We use the keywords, `implicit operator`, followed by a return type (the target type our object is cast into). We can have different cast operator overloads for different target types.

To clarify, let’s create a sample class and overload its implicit cast operator:


```C#
class BankAccount
{
	public decimal Funds { get; set; }
}
```

Our class has a single property that represents the amount of money in the bank account. We want the `BankAccount` object to be able to cast to `decimal`. To enable that, we create an overload that implicitly casts our `BankAccount` object to `decimal`:

Learn to add custom behavior to casting operations.

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

Cast Operator Overloading

Introduction