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A modern, object-oriented language by Microsoft. Used for .NET applications, Unity game development, and enterprise software.
Anders Hejlsberg designed C# at Microsoft as part of the .NET initiative, with the first version shipping in 2002. The language draws inspiration from C++, Java, and Delphi, combining strong typing with modern features that have kept it at the forefront of enterprise and game development. C# runs on the cross-platform .NET runtime (formerly .NET Core), powering web APIs with ASP.NET, desktop applications with WPF and WinUI, mobile apps with .NET MAUI, and games with Unity — one of the world's most popular game engines.
The language evolves rapidly: recent versions have added pattern matching with recursive patterns, record types for immutable data, global using directives, file-scoped namespaces, raw string literals, and primary constructors. Its async/await model, which other languages later adopted, remains one of the most ergonomic approaches to asynchronous programming. LINQ (Language Integrated Query) provides a unified syntax for querying collections, databases, and XML that is unique among mainstream languages.
The tooling ecosystem is strong — Visual Studio, Rider, and VS Code with OmniSharp provide rich IDE experiences, while NuGet hosts over 400,000 packages. Entity Framework Core handles ORM needs, and xUnit, NUnit, and MSTest cover testing. C#'s evolution toward functional programming features — with discriminated unions and roles under active proposal — ensures it continues to attract developers who need both enterprise reliability and language expressiveness.
C# changes can affect behavior across ASP.NET controllers, Entity Framework mappings, and Unity game scripts simultaneously. Comparing files catches modified nullable reference annotations that change null-safety guarantees, altered LINQ expressions that affect query generation and database performance, changed attribute decorators that reconfigure serialization or routing, and updated async patterns that may introduce deadlocks.
Teams diff EF migration files and shared model definitions to verify database schema evolution stays consistent.
UtraDiff compares C# files with C# syntax highlighting, covering LINQ expressions, async/await patterns, attributes, and nullable annotations. Side-by-side view aligns method signatures and property declarations across panels. Inline view collapses using directives to focus on logic changes.
The whitespace ignore toggle handles Visual Studio auto-formatting differences. Alt+Arrow keyboard navigation jumps between modified members, and tokenization distinguishes attribute changes from code modifications.
Supported extensions: .cs