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    <p>If I understand the question correctly, you want to chop the existing array into arrays of (at most) 100k elements, and put those arrays in the array list?</p> <pre><code>ArrayList Split(byte[] filebytes, int range) { range *= 1000; int pos = 0; int remaining; ArrayList result = new ArrayList(); while ((remaining = filebytes.Length - pos) &gt; 0) { byte[] block = new byte[Math.Min(remaining, range)]; Array.Copy(filebytes, pos, block, 0, block.Length); result.Add(block); pos += block.Length; } return result; } </code></pre> <p>Change 1000 to 1024 if that was your intention :)</p> <p>I can't really think of a reason why you'd want to do something like this though. Loading one huge array of bytes and <em>then</em> splitting into blocks is rather inefficient if you could have split them into 100k blocks while reading your data.</p> <hr> <p>Regarding your comment: sending an entire file to a socket should be much simpler than you're making it to be. I have no way of testing, but this should work in .NET 1.1.</p> <pre><code>private void SendFileToSocket(string fileName) { Socket socket = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); using (socket) { socket.Connect("server.domain.com", 12345); using (NetworkStream networkStream = new NetworkStream(socket)) using (FileStream fileStream = File.OpenRead(fileName)) { byte[] buffer = new byte[32768]; while (true) { int bytesRead = fileStream.Read(buffer, 0, buffer.Length); if (bytesRead == 0) break; networkStream.Write(buffer, 0, bytesRead); } } } } </code></pre> <p>The buffer size is a little arbitrary, but it should be large enough.</p>
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    1. COYou're trying to copy something into contb, after verifying it's null. You need to allocate the array first. I'm lost ok what you're trying to achieve though. Read, Split, Concatenate, Write? Makes no sense to me.
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    2. COam doing file transfer prog using socket... all files r very lorge so here i have to split the file and send to the server. server ll Concatenate all bytes and finally write a file this is the goal of this proj.... now hopefully achived it. thanks lot.
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    3. CORead up on *streams* and check some examples. There is no need to build huge arrays containing the entire file. In fact, that's a very **bad** thing to do when your files are large. MSDN is just one of the possible places to read up: http://msdn.microsoft.com/en-us/library/336wast5%28VS.71%29.aspx
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