C# 9.0 Record Type is reference type, but it has value equality feature: two variables of a record type are equal if the types match and all property and field values match. For other reference types, equality means identity. …

Lots of time, when we add text to a multi-line textbox in Windows Forms application, we simply use TextBox.Text += to do the job. However, if you are continuously appending text to the current content, you should use TextBox.AppendText(). There is big performance hit with the TextBox.Text +=. Similar to…

The Task class represents a single operation that usually executes asynchronously. Task object is one of the central components of the task-based asynchronous pattern first introduced in the .NET Framework 4. Task is more light-weighted than thread. The default task scheduler runs the task inside the thread pool. Therefore, the…

Any large project will create lots of dead code (code that is not used by the application) overtime. How to identify these dead code and remove them are a challenge work to do. NDepend tool, as a static analyzer, can scan the whole solution and find out the potential dead…

The System.Text.Json library is included in the runtime for .NET Core 3.1 and later versions. The System.Text.Json is much faster than the commonly used Newtonsoft.Json. However, there are some breaking changes between System.Text.Json and Newtonsoft.Json. This page from Microsoft lists all the differences between them. …

Recently, I worked on a legacy Windows Forms C# application that uses lots of reflection to create instances during runtime. All the type information are stored in a type configuration file. …

In this article, we will discuss how to do ajax file upload with drag and drop box. File input We can use HTML input tag with type=“file” and attribute “multiple” to enable multiple file selection. <input type=”file” id=”files” multiple style=”display: none;” /> It display as a button like following: Click this button…

In C# web API, we use JSON to pass the data back and forth. These JSON data would be deserialized to C# object. Most of time, it is straightforward. However, if the C# object has class inheritance structure and polymorphism, it would be much tricky how to define the JSON…

Debugging Windows service application can be very tricky. Some articles suggested to use VisualStudio to attach to the Windows service thread. But you have to first install the service locally and start it using Service Control Manager. It is quite cumbersome to do so. In this article, we will discuss…