The answer
Yes, unless you have practiced extensively. Under pressure, you will likely forget syntax and built-in methods of a language you aren't deeply comfortable with.
Should You Switch Languages for Interviews?
Is it a bad idea to use a new language in an interview?
More FAQs in Should You Switch Languages for Interviews?
Yes. C# is a powerful, object-oriented language with excellent built-in collections, completely viable for all tech interviews.
If you already know another programming language, you can learn Python syntax and its data structures for interviews in 2 to 3 weeks.
Some interviewers will let you look up minor syntax, or treat your code as pseudocode, but it's risky to rely on this. You are expected to know your language.
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