--- title: The era of the .csproj is over: How Microsoft Just... description: .NET 10 introduces file-based apps, letting developers run a single C# file directly with `dotnet run app.cs` or `dotnet app.cs` without creating a .csproj,... canonical: https://daily.dev/posts/the-era-of-the-csproj-is-over-how-microsoft-just-simplified-c-forever--vldfw0kzc twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The era of the .csproj is over: How Microsoft Just Simplified C# Forever. | daily.dev og:description: .NET 10 introduces file-based apps, letting developers run a single C# file directly with `dotnet run app.cs` or `dotnet app.cs` without creating a .csproj,... og:url: https://daily.dev/posts/the-era-of-the-csproj-is-over-how-microsoft-just-simplified-c-forever--vldfw0kzc og:image: https://api.daily.dev/og/posts/vLDFW0kZC.png og:image:alt: The era of the .csproj is over: How Microsoft Just Simplified C# Forever. 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. # The era of the .csproj is over: How Microsoft Just Simplified C# Forever. **[C\# Corner](https://daily.dev/sources/csharpcorner)** · 3 min read · 56 upvotes · 5 comments ## Summary .NET 10 introduces file-based apps, letting developers run a single C# file directly with `dotnet run app.cs` or `dotnet app.cs` without creating a .csproj, bin, or obj folder structure. The code is still fully compiled and JIT-optimized, not interpreted scripting like the older .csx format. When a script grows beyond quick experimentation, the `dotnet project convert app.cs` command scaffolds a full project automatically, turning file-level directives into a proper .csproj. This removes the traditional scaffolding ceremony for small scripts and prototypes while preserving a smooth path to a full project when needed. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I run a single C# file without creating a .csproj project in .NET 10? In .NET 10, you can run a C# file directly from the terminal using `dotnet run app.cs` or `dotnet app.cs`, with no project file, bin, or obj directory required. The code is still fully JIT-compiled, not interpreted, so it runs with native .NET performance rather than acting as a lightweight scripting layer like the older .csx format. _Developers tracking new .NET runtime capabilities can follow releases like this one on daily.dev._ ### How do I convert a file-based C# script into a full .NET project? Run `dotnet project convert app.cs` to scaffold a complete project structure around an existing script. The command automatically turns file-level directives into a proper .csproj file, so a quick script that grew too large can graduate into a formally structured project without manual copy-pasting or folder setup. _daily.dev helps C# developers stay current on tooling changes like project conversion workflows._ ## Community discussion Top comments from developers on daily.dev. **@spamcatcher** · 7 upvotes > Finally, now that nobody writes code anymore... the agents are really getting it all aren't they **@ristotoldsep** · 4 upvotes > .csproj will survive this. configuration files are famously immortal. **@gojoglacier** · 1 upvotes > Nice :) I love the idea of writing C# scripts like I write Python or Go scripts **@luukoosterhuis** · 1 upvotes > You know this title is highly misleading. Do you really believe only simple scripts are written in .Net? You've clearly not seen an enterprise application **@swarnasharmin** · 0 upvotes > Misleading title. Single-file execution is for small scripts, not enterprise apps. ## Similar posts on daily.dev - [Exploring C\# File-based Apps in .NET 10](https://daily.dev/posts/exploring-c-file-based-apps-in-net-10-yepr485nu) · Milan Jovanović · 12 upvotes · 1 comments - [C\# Finally Has First-Class CLI Scripts in .NET 10](https://daily.dev/posts/c-finally-has-first-class-cli-scripts-in-net-10-r3hjflu70) · Atomic Spin · 31 upvotes · 2 comments - [The best new features of C\# 14](https://daily.dev/posts/the-best-new-features-of-c-14-6gsbbjwv4) · InfoWorld · 46 upvotes · 4 comments --- Tags: [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/the-era-of-the-csproj-is-over-how-microsoft-just-simplified-c-forever--vldfw0kzc) ```json 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Do you really believe only simple scripts are written in .Net? You’ve clearly not seen an enterprise application","datePublished":"2026-10-15T06:59:22.741Z","url":"https://daily.dev/posts/vLDFW0kZC#c-jQldk564s","author":{"@type":"Person","name":"Luuk Oosterhuis","url":"https://daily.dev/luukoosterhuis","image":"https://avatars.githubusercontent.com/u/304927767?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"Misleading title. Single-file execution is for small scripts, not enterprise apps.","datePublished":"2026-10-17T07:59:06.511Z","url":"https://daily.dev/posts/vLDFW0kZC#c-nX9RLUcpD","author":{"@type":"Person","name":"Swarna Sharmin","url":"https://daily.dev/swarnasharmin","image":"https://media.daily.dev/image/upload/s--joHEq_jD--/f_auto/v1791022797/avatars/avatar_ZL6bebyCVkszL2cr0g8ab?_a=BAMAMicg0"}}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/the-era-of-the-csproj-is-over-how-microsoft-just-simplified-c-forever--vldfw0kzc#faq","mainEntity":[{"@type":"Question","name":"How do I run a single C# file without creating a .csproj project in .NET 10?","acceptedAnswer":{"@type":"Answer","text":"In .NET 10, you can run a C# file directly from the terminal using `dotnet run app.cs` or `dotnet app.cs`, with no project file, bin, or obj directory required. 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