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I have given your answer but he was not agreed.
Really! :( . Please confirm with him what is the another way and post the answer here. :) AFAIK, the count of interface doesn't make the way different.
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Sir,
This was Interview question. I have given your answer but he was not agreed.
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How we Implement 100 interface in a single class?
Are you going to implement that much complex system? In another way this seems like a hypothetical question :).
Back to your question, the implementation must like a normal way like:
public class yourclassname : interface1, interface2 ..... ,interface100
{
}
Also, I would suggest the below Stack overflow discussion about the discussion on this kind of similar problem and answered by the C# Compiler designer Eric Lipert:
http://stackoverflow.com/questions/4285584/how-many-interfaces-are-allowed-to-be-implemented
Hope this helps!