In C# what is perception? [closed]

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In one of the job interview some one asked me, In C# what is perception? And i don't know what he mean to say until now. Can some one brief it ?

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There is no such thing as perception in C#.

This word does not exist in C# 4.0 spec (http://msdn.microsoft.com/en-us/library/ms228593.aspx) at all.

Probably you've misunderstood a different word.