Hung Hoang

Posts

Understanding Asynchronous Programming

Asynchronous programming allows threads or workers to handle multiple tasks concurrently. A Task represents a unit of work, and the await keyword lets you pause execution without blocking the thread—freeing it to handle other operations while waiting for the task to complete. 🍳 Real-Life Analogy: Making Breakfast Imagine you're preparing breakfast. The tasks might include: Brewing coffee Heating the pan Frying eggs and bacon Toasting bread Spreading jam Pouring juice If you perform these tasks synchronously, completing one before starting the next, it would take significantly longer. But with an asynchronous approach, you can heat the pan and, while waiting, brew coffee, toast bread, and pour juice. By overlapping tasks, you reduce idle time and improve overall efficiency. This mirrors how asynchronous code works: it enables your application to stay responsive and efficient by not waiting idly for each operation to finish. 🧪 Using Async-Await Properly In C#, marki...

What is Cryptography and how to secure sensitive data in .NET app with encryption

What is Cryptography? Cryptography is the process of securing data through encryption, hashing, digital signatures. It helps protect communication messages transmitted over non-secure networks, ensuring that only authorized parties can read the information. Encryption and Decryption Encryption is the process of converting plaintext data into ciphertext , which appears random and meaningless to anyone who does not have the key. Decryption is the reverse process — converting ciphertext back into readable plaintext. The strength of encryption depends on several factors, including the algorithm used and the length of the encryption key. Generally, the longer the key , the harder it is to decrypt the ciphertext without authorization. When choosing an encryption algorithm, it’s best to select one that has been thoroughly tested and widely used over time , as new or unproven algorithms may have hidden weaknesses. Cryptographic Keys At the he...

Declarative Programming in Angular with Async Pipe and shareReplay

A declarative approach is a way that focuses on writing code that specifies what the application should do, rather than detailing how it should be done. For example, with the async pipe in Angular, we don’t need to write code to manually subscribe to an Observable, handle its data, and update the view. Instead, we simply specify in the template that we want the data from the Observable using the async pipe. Angular handles all the underlying processes to retrieve and display the data It's often used in reactive programming with RxJS and Angular's built-in features, such as the async pipe. export class ProductComponent { product$ = this.productService.getProduct(); constructor(private productService: ProductService) {} } The product observable will hold the product data and the async pipe in the template will automatically subscribe and unsubscribe observable <div *ngIf="product$ | async as product"> <h1>{{ product.name }}</h1> <p>{{...

LINQ - Deferred Execution

Deferred Execution means that queries are not executed immediately at the time it's being created. The benefit of this is to improve performance by avoiding unnecessary executions. It also allows the query to be extendable when needed such as sorting, filtering. In the example below, the queries to retrieve courses are not being executed yet var context = new DbContext(); var courses = context.Courses .Where(c => c.Level == 1) .OrderBy(c => c.Name); The query is only executed when one of the following scenarios occurs: Iterating over query variable Calling ToList, ToArray, ToDictionary Calling First, Last, Single, Count, Max, Min, Average For example when we loop through the course or turn the result to a list: foreach ( var c in courses) Console.WriteLine(c.Name); OR context.Courses .Where(c => c.Level == 1) .OrderBy(c => c.Name).ToList();

Criteria for a successful IT Project

For a successful IT project there are several key criteria, which are fundamental constraints serving as the project’s backbone. It’s important to recognize and prevent factors that contribute to ‘scope creep', a common pitfall in project management. Additionally, taking into account vital elements beyond the traditional triple constraints that are crucial for the success of the project. What is The Triple Constraint? The Triple Constraint is the Project Management Triangle ( Iron Triangle ), a model of the constraints inherent in managing a project and consists of three primary elements: Cost, Scope, and Time Cost: The project budget Scope: The tasks required to fulfill the project’s goals Time: The schedule for the project to reach The purpose of the Triple Constraint is to provide a framework for project managers to make informed decisions throughout the project lifecycle. It guides project planning by helping project managers establish realistic goals and objectives. I...

Maximizing Efficiency: The Power of Database Indexing

What is database performance? There are two main aspects of database performance: response time and throughput . Response time is the total time it takes to process a single query and returns result to the user. It's critical metrics because it directly impacts the user's experience, especially in applications where fast access to data is essential. The response time includes CPU time (complex queries will require more computational power and increase processing time), disk access, lock waits in multiple-user environment (more about database transaction ), network traffic. Throughput refers to how many translations the system can handle per second (TPS). A transaction could include different activities to retrieve and manipulate data. A single command like SELECT, INSERT, UPDATE, DELETE or a series of commands could be used to trigger these activities. If you’re running an e-commerce site, a single transaction might include checking the inventory, confirming the payment, and...