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I need to build an web application C# and below is what I'm stuck with

Can I use Stack Exchange's API with Key? Do they have a "hello world" key can be used for learning purpose. I wish to get the count of response posted for any question on Stack Exchange ... https://api.stackexchange.com/

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You can use the API without a key, you'll just have lower limits without it. From the application registration form:

Upon registering, you'll be provided an API key which grants your app a much larger per-day request quota than using the API anonymously.

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