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Async SSE endpoint in ASP.NET Core

By Tan Lee Published on Mar 04, 2025 197

Server-Sent Events (SSE) allow a client to receive real-time updates from the server. Unlike WebSockets, SSE is a simpler alternative that works over HTTP and is ideal for one-way communication, such as notifications.

Cannot convert null to type parameter 'T'

By Tan Lee Published on Dec 24, 2024 295

When working with generic methods in C#, you may encounter the following compiler error while trying to return null:

How to use Razor View Engine in ASP.NET Core

By Tan Lee Published on Feb 03, 2025 362

The ASPX View Engine, a legacy feature in ASP.NET MVC, was part of the framework from its early days.

How to Convert DateTime to Unix Timestamp in C#

By Tan Lee Published on Jul 11, 2024 2.16K

In .NET, you can easily convert DateTime object back to a Unix timestamp.

How to format number with commas and decimal in Javascript

By Tan Lee Published on Feb 16, 2024 451

In JavaScript, you can format numbers with commas and decimal points using various methods.

How to prevent target blank links from opening in a new window in Cefsharp

By Tan Lee Published on Jul 03, 2024 733

In CefSharp, which is a .NET wrapper for the Chromium Embedded Framework (CEF), you can control how links with target="_blank" are handled.

How to fix System.InvalidOperationException: Scheme already exists: Identity.Application

By Tan Lee Published on Jun 17, 2024 2.55K

The error message System.InvalidOperationException: Scheme already exists: Identity.Application typically occurs when you're trying to add Identity to your ASP.NET Core project, but the scheme "Identity.Application" is already registered in the authentication options.