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    <p><strike>This is because you have created a byte array of size 1024. So, even in case inputStream length is less than 1024, it will still write 1024 bytes to your file.</p> <p>You should initialize it with inputStream size so that only limited bytes gets written to your file:</p> <pre><code>byte[] buffer = new byte[inputStream.Length]; </code></pre> <p></strike></p> <p><strong>UPDATE</strong></p> <p>Silvermind in comment pointed out right, let buffer array size to be 1024. Instead <code>use byte size returned by Read</code> method to write to your file so that only bytes read gets written to file:</p> <pre><code>int bytesRead; while ((bytesRead = inputStream.Read(buffer, 0, buffer.Length)) &gt; 0) { Console.WriteLine("bufferlength " + buffer.Where(x =&gt; x != 0) .ToArray().Length); Console.WriteLine(new FileInfo(@"D:\Temp\test2.txt").Length); outputStream.Write(buffer, 0, bytesRead); &lt;- HERE outputStream.Flush(); } </code></pre> <hr> <p>On a sidenote, you should <code>dispose FileStream's</code> after use to avoid any memory leaks. You can <code>wrap them in using block</code> which will dispose it automatically for you after use.</p> <pre><code>using (FileStream inputStream = new FileStream(@"C:\Temp\test.txt", FileMode.Open)) { using (FileStream outputStream = new FileStream(@"C:\Temp\test2.txt", FileMode.OpenOrCreate)) { byte[] buffer = new byte[inputStream.Length]; Console.WriteLine(new FileInfo(@"C:\Temp\test.txt").Length + "\n"); int bytesRead; while ((bytesRead = inputStream.Read(buffer, 0, buffer.Length)) &gt; 0) { Console.WriteLine("bufferlength " + buffer.Where(x =&gt; x != 0) .ToArray().Length); Console.WriteLine(new FileInfo(@"D:\Temp\test2.txt").Length); outputStream.Write(buffer, 0, bytesRead); &lt;- HERE outputStream.Flush(); } Console.WriteLine("\n" + inputStream.Length); Console.WriteLine(outputStream.Length); } } </code></pre>
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    1. POOutput stream writing more that read - C#
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    1. USRohit Vats
    1. USRohit Vats
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    1. POOutput stream writing more that read - C#
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    2. VO
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      1. VTAcceptedByOriginator
    1. COAh, I see. Thank you sir
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      1. USDawnFreeze
    2. COYour welcome DawnFreeze. Please accept an answer if your issue is resolved.
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      1. USRohit Vats
    3. COPerhaps it's a large file? Now you are putting the entire file in memory. My guess is that `Read` returns an `int` how many bytes are read and that he can use that.
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      1. USSilvermind
 

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