read from file in c#

The code

FileStream fs = new FileStream(fileName, FileMode.Open)
fs.ReadByte()

will read 开发者_JAVA百科a byte from the file, what should I do to read 2 bytes at a time ?

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Allocate a 2-byte array and pass that as argument to the FileStream.Read function.

byte[] twoBytes = new byte[2];
int bytesRead = fs.Read(twoBytes, 0, twoBytes.Length);

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Wrap the call up in a loop and read into a datastructure eg. byte[] ?

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Use the 'normal' read method. Use the parameters to define the number of bytes you want to read.