C# Programming (Intermediate) - Lecture 4: How to Prevent SQL Injection with Parameterized Queries

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The topics that have been covered in Lecture 4:

• How to use Task Factory to start new Tasks for multi-threaded programming and responsive user interface (UI) design
• How to access elements of different threads such as accessing textbox from sub-thread started as a task by using Dispatcher BeginInvoke
• How to properly convert code blocks into methods to prevent duplicate and copy-paste code programming
• When does fields, properties, classes of static classes are initialized
• How to call a constructor of a static class and when it is initialized
• What is SQL injection and how to prevent it with parameterized queries
• How to write parameterized queries in C# for MS-SQL server
• How to properly construct a database class to handle all database operations with both raw queries and parameterized queries
• When to and how to use using statement code blocks

Introduction

Multi-threaded programming has become an essential part of modern software development, especially when it comes to responsive user interface (UI) design. One of the most popular tools for multi-threaded programming in C# is Task Factory. With Task Factory, developers can easily create new tasks and run them concurrently, allowing for improved performance and a more responsive UI. However, using Task Factory can be tricky, especially when it comes to accessing elements of different threads, preventing code duplication, initializing static classes, and preventing SQL injection.

In this article, we will explore the ins and outs of using Task Factory for multi-threaded programming and responsive UI design. We will also discuss how to access elements of different threads using Dispatcher BeginInvoke, convert code blocks into methods to prevent duplication and copy-paste programming, initialize static classes, prevent SQL injection using parameterized queries, write parameterized queries in C# for MS-SQL server, construct a database class to handle all database operations with both raw queries and parameterized queries, and use using statement code blocks properly.

How to use Task Factory to start new Tasks for multi-threaded programming and responsive UI design

Task Factory is a powerful tool for multi-threaded programming and responsive UI design. With Task Factory, developers can create new tasks and run them concurrently, improving performance and ensuring a responsive UI. The following steps outline how to use Task Factory to start new tasks for multi-threaded programming and responsive UI design:

Step 1: Create a new Task Factory object.

Step 2: Create a new task using the Task Factory object and pass in a delegate that represents the code to be executed by the new task.

Step 3: Optionally, pass in a CancellationToken to cancel the task if needed.

Step 4: Optionally, configure the task with a TaskCreationOptions object to specify additional options for the task, such as setting the task to run on a specific thread or specifying a long-running task.

Step 5: Start the task using the Start() method of the Task object.

Step 6: Wait for the task to complete using the Wait() method of the Task object, or use the ContinueWith() method to specify a callback that will be called when the task completes.

How to access elements of different threads using Dispatcher BeginInvoke

When working with multi-threaded programming, it's common to need to access elements of different threads, such as accessing a textbox from a sub-thread started as a task. To do this, developers can use Dispatcher BeginInvoke. ... https://www.youtube.com/watch?v=4nax86sau6k