namespaces: using System & using System.IO

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so my program has these 2 lines at the beginning

using System;
using System.IO;

Question: Is the second statement actually necessary to include Sytem.IO methods and properties in my code? It seems that 'System.IO' is a 'child' of the namespace 'System'. Shouldn't the first line grab all the child namespaces too? Or Do I not understand namespaces correctly?

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