Vesion of C#
| Version | CLR | Date | .NET Framework | Visual Studio |
| C# 1.0 | 1.0 | January 2002 | .NET Framework 1.0 | Visual Studio .Net 2002 |
| C# 1.2 | 1.1 | April 2003 | .NET Framework 1.1 | Visual Studio .Net 2003 |
| C# 2.0 | 2.0 | November 2005 | .NET Framework 2.0 | Visual Studio 2005 |
| C# 3.0 | 2.0/2.0 SP1 | November 2007 | .NET Framework 2.0/3.0/3.5 | Visual Studio 2008 |
| C# 4.0 | 4.0 | April 2010 | .NET Framework 4.0 | Visual Studio 2010 |
| C# 5.0 | 4.5 | August 2012 | .NET Framework 4.5 | Visual Studio 2012 |
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Features of C# according to Versions
| Summary of versions |
| C# 2.0 | C# 3.0 | C# 4.0 | C# 5.0 | Future |
- Generics
- Partial types
- Anonymous methods
- Iterators
- Nullable types
- Private setters (properties)
- Method group conversions (delegates)
- Covariance and Contra-variance
- Static classes
| - Implicitly typed local variables
- Object and collection initializers
- Auto-Implemented properties
- Anonymous types
- Extension methods
- Query expressions
- Lambda expressions
- Expression trees
- Partial Methods
| - Dynamic binding
- Named and optional arguments
- Generic co- and contravariance
- Embedded interop types ("NoPIA")
| - Asynchronous methods
- Caller info attributes
| C# 5.0 - Compiler-as-a-service (Roslyn)
C# 6.0 - Import type members into namespace
- Succinct syntax for primary constructors
- Readonly properties
- Property expressions (property lambdas)
- Method expressions
- Parameter arrays for IEnumerable interfaces
- Succinct null checking
- Multiple return values
- Constructor type inference
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