An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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Please tell me last version of .net framework?
also tell me what version of c# support in last version of .net framework?
Unless Microsoft changes its mind, the last version is 4.8
Also, see https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version