Notes on software and the ideas behind it

Find the meaning
behind the code.

I’m Fred Yang. I write about software—how it works, why it behaves the way it does, and the ideas that make code easier to reason about.

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Working notes / 2026

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Architecture, reactivity, and the hidden relationships that shape frontend systems.

SharePoint

Delegate Controls

WSS introduces a powerful new extensibility mechanism known as delegate controls. In some ways, a delegate control is similar to a named placeholder because it defines a region inside a master page that can...
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SharePoint

WSS Navigation Component

Several standard controls are included with default.master that provide the basic infrastructure for navigation. For example, the ASP.NET SiteMapPath control that has been positioned at the very top of the page populates a breadcrumb...
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SharePoint

Web Part Pages

Before diving into the details of how Web Part pages work, two important aspects of their architecture must be noted. First, support for customizing and personalizing Web Parts is available in site pages but...
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SharePoint

User control in wss3

It is important to understand that WSS does not support user customization of user controls. User controls are always loaded from the file system of the front-end Web server and compiled into assembly DLLs....
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SharePoint

Safe Mode Processing

Ghosted site page and application page can containe inline code, it is basically traditional aspx page. But all customized(unghosted) site pages are parsed and processed in a special mode known as safe mode. The...
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