
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

Consider the following `Holder` class:

```C#
public class Holder
{
    public string[] Items { get; private set; }

    public Holder(int holderSize)
    {
        Items = new string[holderSize];
    }

    public override string ToString()
    {
        string result = "Items inside: ";

        foreach (var item in Items)
        {
            result = result + item + " ";
        }

        return result;
    }
}
```
It has the `Items` property, which is `string` type. The `Holder` class holds string items. What if we need a similar class that holds integers? The functionality is the same, but the type is different.

We could suggest something like the following:


```C#
public class IntHolder
{
    // Now, the Items property holds integers
    public int[] Items { get; private set; }

    public IntHolder(int holderSize)
    {
        Items = new int[holderSize];
    }

    public override string ToString()
    {
        string result = "Items inside: ";

        foreach (var item in Items)
        {
            result = result + item + " ";
        }

        return result;
    }
}
```

This works. Is this feasible if we want to create such a class for many more types, though? We’d be copying the same code and changing the type of the internal array used to hold the items.

A better approach uses generics.

# Generic types

Generics are classes with members whose types are specified during variable declaration and object creation. In other words, instead of having `IntHolder` or `StringHolder`, we can have a single class that instantiates as follows:


```C#
Holder<int> intHolder = new Holder<int>(); // Holder class holds integers
Holder<string> stringHolder = new Holder<string>(); // Holder class holds strings
```

With a generic `Holder` class, the type of the `Items` property is specified during variable declaration instead of being hard-coded inside the class:

Learn about classes that accept type parameters.

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

Generic Types

Introduction