Migrate custom ASP.NET Web Forms server controls (WebControl, CompositeControl) to Blazor using BlazorWebFormsComponents. Covers RenderContents/HtmlTextWriter preservation, TagKey mapping, AddAttributesToRender, CreateChildControls, and the one-line-change migration pattern. WHEN: 'migrate custom control', 'webcontrol to blazor', 'rendercontents migration', 'htmltextwriter blazor', 'custom server control'. FOR SINGLE OPERATIONS: use /bwfc-ascx-migration for .ascx user controls, /bwfc-migration for full page migration.
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