In 2005, installing Windows software was a nightmare. You downloaded an .msi or setup.exe , ran a wizard, crossed your fingers, and hoped it didn't break your registry.
| Feature | Description | |---------|-------------| | | List<T> , Dictionary<TKey,TValue> – type-safe collections without casting | | Nullable Types | int? , bool? – value types that can be null | | Anonymous Methods | Inline delegates (predecessor to lambdas in C# 3) | | Partial Classes | Split class definition across files (used for WinForms/ASP.NET designers) | | Generic Delegates | Action , Func , Predicate<T> | | Iterators ( yield return ) | Simplified stateful iteration | | Nullable<T> struct | Official support for database/value nullability | | System.Transactions | Lightweight and distributed transaction support | | ASP.NET 2.0 | Master pages, themes, Web Parts, membership/roles, data source controls | | ClickOnce Deployment | Self-updating Windows Forms apps from a web server | | ADO.NET 2.0 | SqlBulkCopy , DataTable improvements, DbProviderFactory pattern | microsoft net framework version 20
Provided a massive overhaul for web development, including new data-bound controls, a simplified code-behind model, and built-in Role Management and Membership systems. In 2005, installing Windows software was a nightmare
Windows XP Professional x64 Edition was released around the same time, and the computing world was teetering on the edge of the 64-bit transition. .NET 2.0 was the first version of the framework to fully support 64-bit native execution. , bool
.NET 2.0 introduced . For the first time, developers could deploy applications via a web link. The app would install, run in a secure sandbox, and automatically update itself. It was the spiritual ancestor of the modern App Store model, delivered years before the iPhone existed.
You must install .NET 2.0 separately on Windows 10/11 Truth: Enable .NET Framework 3.5 (includes 2.0, 3.0, 3.5) in Windows Features.
| Version | End of Mainstream Support | End of Extended Support | |---------|--------------------------|--------------------------| | .NET 2.0 SP2 | July 12, 2011 | (Extended) | | .NET 2.0 (original) | December 14, 2010 | December 14, 2010 |