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copied!<p>I figured out the problem!</p> <p>The thread synchronization works as it should and so does the TextWriter.Synchronized() so the problem isn't really the threads at all. Take this into account:</p> <p>I create 3 instances of the Log class and point them all to "test.txt"</p> <pre><code>Log log1 = new Log(); Log log2 = new Log(); Log log3 = new Log(); log1.Open("test.txt"); //new file handle as instance member log2.Open("test.txt"); //new file handle as instance member log3.Open("test.txt"); //new file handle as instance member </code></pre> <p>In each call to Open() I am opening a new file handle to the same file, so I have 3 unique and separate file handles. Each file handle or Stream has it's own file pointer which seeks along the stream as I read or write.</p> <p>So, if we have the following:</p> <pre><code>log1.WriteLine("this is some text"); //handled on thread 1 log2.WriteLine("testing"); //handled on thread 2 </code></pre> <p>If Thread 1 starts to write to the file and completes the file contents will be</p> <p><em>this is some text</em></p> <p>When Thread 2 starts to write, because the file handles and streams are unique the current location of log1's file pointer is at 16 and log2's is still at 0 so after log2 is done writing, the resulting log file will read:</p> <p><strong>testing</strong> <em>some text</em></p> <p>So, all I need to do is make sure I open only 1 unique FileStream per log file and do the synchronization like I have been. Works great now!</p>

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