Introduction to .NET with C#

Introduction to .NET with C#

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1. Introduction

In this section we will learn about what is .NET, how to setup the development environment and how to start making some console apps. Apart from that we will also learn how to take input from the user in the console for making interactive applications.

What is the .NET Platform exactly?

Creating a Console Application

Taking input from the User

Task - Building a Simple Calculator

Dealing with Exceptions caused by User Input

Task - Improving the Calculator

Task - File Based Calculator

2. Asynchronous Programming and Introduction to Web Services

In this section, we will be learning how to perform multiple tasks at once to improve the performance and responsiveness of applications. We will also briefly learn what Web Services and APIs are. This will give us an introduction to how the internet and websites work. We will also learn how to use APIs.

What is Asynchronous Programming?

Implementing an Asynchronous Method

Task - Asynchronously Reading Files

Introduction to APIs

Making a GET Request

Task - Using an API

Handling Exceptions caused by HTTP Request

Task - Exception Handling for API Response

3. Introduction to Databases with .NET

In this section we will learn what are databases, specifically what are SQL databases and how to create them. We will study their structure and will learn to perform some basic operations on the databases. This chapter will serve as an introduction to ADO.NET which is a .NET module used for interacting with databases.

What is a Database?

Structure of a Relational Database

Setting Up A MySQL Server

Connecting to the MySQL Server

Task - Writing Connection Strings

Executing Commands

Task - Executing MySQL Commands

MySqlCommand Methods

Task - Connecting to a MySQL Database and Executing Commands

4. CRUD Operations with MySQL

In this section, we'll cover the fundamental CRUD operations (Create, Read, Update, Delete) using SQL. We'll explore SQL syntax at a basic level and recap how to implement each SQL statement in C# code. While some parts may serve as a review from the previous section, this will provide a solid understanding of essential database concepts, enabling you to understand both the SQL and C# code and write it independently.

Introduction to CRUD Operations

Installing & Using MySQL Workbench

CREATE - Part I

Task - Using CREATE

CREATE - Part II

Task - Using INSERT

Task - Using SELECT

Task - Using UPDATE

Delete - Part I

Delete - Part II

Task - Using DELETE

5. Optimizing Database Operations

In this chapter we will learn about additional functions or methods for making database management more efficient. For-example executing multiple SQL commands at once using Stored Procedures, and retrieving data in bulk from the SQL database using DataSet.

Stored Procedures

Task - Executing Stored Procedures

DataReader vs DataSet

DataAdapter & DataSet

Task - Reading Tables using MySqlDataAdapter

Conteúdo do Curso

Introduction to .NET with C#

Introduction to .NET with C#

1. Introduction

What is the .NET Platform exactly?Creating a Console Application Taking input from the User Task - Building a Simple Calculator Dealing with Exceptions caused by User Input Task - Improving the Calculator Reading Files Writing Files Task - File Based Calculator

2. Asynchronous Programming and Introduction to Web Services

What is Asynchronous Programming?Implementing an Asynchronous Method Task - Asynchronously Reading Files Introduction to APIs Making a GET Request Task - Using an API Handling Exceptions caused by HTTP Request Task - Exception Handling for API Response

3. Introduction to Databases with .NET

What is a Database?Structure of a Relational Database Setting Up A MySQL Server Connecting to the MySQL Server Task - Writing Connection Strings Executing Commands Task - Executing MySQL Commands MySqlCommand Methods Task - Connecting to a MySQL Database and Executing Commands

4. CRUD Operations with MySQL

Introduction to CRUD Operations Installing & Using MySQL Workbench CREATE - Part I Task - Using CREATE CREATE - Part II Task - Using INSERT Read Task - Using SELECT Update Task - Using UPDATE Delete - Part I Delete - Part II Task - Using DELETE

5. Optimizing Database Operations

Stored Procedures Task - Executing Stored Procedures DataReader vs DataSet DataAdapter & DataSet Task - Reading Tables using MySqlDataAdapter What's Next?

MySqlCommand Methods

Note

If you're unable to delete objects from the MySQL server, it is possible that the server is running in safe mode. To disable safe mode, you can run the following query: SET SQL_SAFE_UPDATES=0;.

Important Points

We use ExecuteNonQuery for commands which modify the database;
ExecuteReader and ExecuteScalar are for querying commands that retrieve data from the database;
ExecuteReader returns a MySqlDataReader object;
MySqlDataReader has a method called read() which reads the rows in a sequential manner; We need to Close() the MySqlDataReader object after use;
ExecuteScalar returns an object which can be type-casted into the appropriate data type.

1. The following command selects and returns all the students that have marks higher than 90, which command is the most appropriate for executing this query?

2. The following command selects and returns the name of the oldest student in the class, which command is the most appropriate for executing this query?

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Seção 3. Capítulo 8

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