This isn't remotely true. Any person that has learned for example C/C++ can be productive in a week of having picked up C#. At the start you can just translate

This isn't remotely true. Any person that has learned for example C/C++ can be productive in a week of having picked up C#. At the start you can just translate all the basic C constructs such as classes/structs/methods/for loops/ifs etc. to their C# version (which is extremely similar in nature). After that you can add C# specifics such as LINQ etc, but it's not necessary to be proficient in the language. Online snippets of anything you search for invariably just works, I've never had an issue of something being outdated.