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    <p>The problem is not in your application. In fact, if you open Notepad directly, enter <code>0,1,0,1,0,1,0,1,</code> 20 times, save the file (ANSI encoding), and re-open the file, you will see the same behavior.</p> <p>By default, the text file will be written in UTF-8 encoding without a Byte Order Mark (BOM). When Notepad opens the file, it first must detect the proper encoding (e.g., Unicode or UTF8) based on only the contents of the text file. This is done based on statistical analysis, using the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd318672%28v=vs.85%29.aspx" rel="nofollow"><code>IsTextUnicode</code></a> API. The API notes that:</p> <blockquote> <p>The IS_TEXT_UNICODE_STATISTICS and IS_TEXT_UNICODE_REVERSE_STATISTICS tests use statistical analysis. These tests are not foolproof. The statistical tests assume certain amounts of variation between low and high bytes in a string, and some ASCII strings can slip through.</p> </blockquote> <p>In the example of <code>0,1,0,1,0,1,0,1</code> repeated 20 times, the <code>IsTextUnicode</code> function incorrectly indicated the text was Unicode-encoded rather than UTF-8 encoded. (This type false positive is perhaps most infamously present in <a href="http://en.wikipedia.org/wiki/Bush_hid_the_facts" rel="nofollow">this bug</a>.)</p> <p>As evidence, the following :</p> <pre><code>[DllImport("Advapi32", SetLastError = false)] static extern bool IsTextUnicode(byte[] buf, int len, ref int opt); ... int iter = 20; string test = string test = String.Join("", Enumerable.Repeat("0,1,0,1,0,1,0,1,", iter)); var bytes = UTF8Encoding.UTF8.GetBytes(test); int opt = 0x20; // IS_TEXT_UNICODE_STATISTICS; Console.WriteLine(IsTextUnicode(bytes, bytes.Length, ref opt)); </code></pre> <p>If <code>iter &gt; 10</code> (e.g., for more than 10 repetitions), the encoding will be interpreted, incorrectly, as Unicode.</p>
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    1. POHow to generate repetitive bit pattern (strings) & export into text file?
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    1. COInterestingly, when `0` (one octet `0x30`) followed by `,` (`0x2C`) is interpreted as a little-endian 16-bit word, we get `0x2C30`, which corresponds to `U+2C30`. Similarly `1` followed by `,` becomes `U+2C31`. So what Notepad really interpretes is `ⰰⰱⰰⰱⰰⰱ ...` which is like `ababab ...` in [Glagolitic script](http://en.wikipedia.org/wiki/Glagolitic_alphabet). Beauty.
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      1. USJeppe Stig Nielsen
    2. COIf you open the file from inside Notpad, you can specify the encoding in the _Open_ dialog. If you open from the command line, you can use `/A` to enforce ANSI (which will be good enough in this case), as in: `notepad.exe /A C:\BField_pattern_01010101.txt`.
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