Answer» Some of the important input-output classes are:
| I/O Class | Description |
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| FileStream | For input-output in a file. |
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| BinaryReader | For reading data from a binary stream. |
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| BinaryWriter | For writing data in binary format. |
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| File | For manipulating files. |
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| StreamReader | For reading characters from a stream. |
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| StreamWriter | For writing characters into a stream. |
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| StringReader | For reading characters from a string buffer. |
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| StringWriter | For writing characters into a string buffer. |
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| Directory | For manipulating a directory structure. |
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| DirectoryInfo | For performing operations on directories. |
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