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Binary File Reading through FileStream

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO; public class MainClass {     public static void Main() {         int nCols = 16;         FileStream inStream = new FileStream("c:\\a.txt", FileMode.Open, FileAccess.Read);         long nBytesToRead = inStream.Length;         if (nBytesToRead > 65536 / 4)             nBytesToRead = 65536 / 4;         int nLines = (int)(nBytesToRead / nCols) + 1;         string[] lines = new string[nLines];         int nBytesRead = 0;         for (int i = 0; i < nLines; i++) {             StringBuilder nextLine = new StringBuilder();             nextLine.Capacity = 4 * nCols;             for (int j = 0; j < nCols; j++) {                 int nextByte = inStream.ReadByte();                 nBytesRead++;                 if (nextByte < 0 || nBytesRead > 65536)                     break;                 char nextChar = (char)nextByte;                 if (nextChar < 16)                     nextLine.Append(" x0" + string.Format("{0,1:X}", (int)nextChar));                 else if                     (char.IsLetterOrDigit(nextChar) || char.IsPunctuation(nextChar))                     nextLine.Append("  " + nextChar + " ");                 else                     nextLine.Append(" x" + string.Format("{0,2:X}", (int)nextChar));             }         }         inStream.Close();     } }