Which version of C# am I using

It depends upon the .NET Framework that you use. Check Jon Skeet’s answer about Versions.

Here is short version of his answer.

C# 1.0 released with .NET 1.0

C# 1.2 (bizarrely enough); released
with .NET 1.1

C# 2.0 released with .NET 2.0

C# 3.0 released with .NET 3.5

C# 4.0 released with .NET 4

C# 5.0 released with .NET 4.5

C# 6.0 released with .NET 4.6

C# 7.0 released with .NET 4.6.2

C# 7.3 released with .NET 4.7.2

C# 8.0 released with NET Core 3.0

C# 9.0 released with NET 5.0

C# 10.0 released with NET 6.0

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