--- title: How to Design a Reusable C# Library | daily.dev description: Transforming working code into a reusable library requires deliberate design decisions. Key steps include choosing descriptive names, ensuring API consistency,... canonical: https://daily.dev/posts/lwesxspo5 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How to Design a Reusable C# Library | daily.dev og:description: Transforming working code into a reusable library requires deliberate design decisions. Key steps include choosing descriptive names, ensuring API consistency,... og:url: https://daily.dev/posts/lwesxspo5 og:image: https://api.daily.dev/og/posts/lWesxSpo5.png og:image:alt: Post cover image og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How to Design a Reusable C# Library **[.NET](https://daily.dev/sources/dotnetsquad)** · [@barion](https://daily.dev/barion) · 3 upvotes · 0 comments ## Summary Transforming working code into a reusable library requires deliberate design decisions. Key steps include choosing descriptive names, ensuring API consistency, introducing clear concepts (like repository patterns), creating abstractions to hide implementation details, and organizing code with nested namespaces. The tutorial demonstrates refactoring EF Core code for immutable entities, showing how to evolve from inconsistent extension methods to a clean, interface-based library with intuitive method names and minimal surface area. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#architecture](https://daily.dev/tags/architecture), [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/lwesxspo5) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/lwesxspo5","headline":"How to Design a Reusable C# Library","text":"Shared: How to Design a Reusable C# Library","url":"https://daily.dev/posts/lwesxspo5","datePublished":"2026-02-03T09:45:27.352Z","dateModified":"2026-02-03T09:45:27.354Z","author":{"@type":"Person","name":"Barion","url":"https://daily.dev/barion","image":"https://avatars.githubusercontent.com/u/76686287?v=4","description":"Creating professional .NET Apps, Unity Games and Minecraft Mods.","worksFor":{"@type":"Organization","name":"Solid AI","logo":"https://media.daily.dev/image/upload/s--ASl-Tjzy--/f_auto/v1765182644/companies/solidai"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":10935}},"image":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":3},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/bMbrQrIiG"},"isPartOf":{"@type":"WebPage","url":"https://daily.dev/squads/dotnetsquad","name":".NET"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":".NET","item":"https://daily.dev/squads/dotnetsquad"},{"@type":"ListItem","position":3,"name":"How to Design a Reusable C# Library"}]} ```