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    <p>What is the range of your numbers? Assuming they can fit in a 16-bit integer, I would:</p> <ul> <li>Store all your numbers as <a href="http://en.wikipedia.org/wiki/Short_integer" rel="nofollow noreferrer">16-bit integers</a> (2 bytes per number, range -32,768 to 32,767)</li> <li>Build a bytestream of 16-bit integers (<a href="http://en.wikipedia.org/wiki/External_Data_Representation" rel="nofollow noreferrer">XDR</a> might be a good option here; at very least, make sure to handle <a href="http://en.wikipedia.org/wiki/Endianness" rel="nofollow noreferrer">endianness</a> correctly)</li> <li><a href="http://en.wikipedia.org/wiki/Base64" rel="nofollow noreferrer">Base64</a> encode the bytestream, using the modified base64 encoding for URLs (net is about 3 characters per number)</li> </ul> <p>As an added bonus you don't need comma characters anymore because you know each number is 2 bytes.</p> <p>Alternatively, if that isn't good enough, I'd use <a href="http://zlib.net/" rel="nofollow noreferrer">zlib</a> to compress your stream of integers and then base64 the zlib-compressed stream. You can also switch to 32-bit integers if 16-bit isn't a large enough range (i.e. if you really need numbers in the 1,000,000,000 range).</p> <p><strong>Edit:</strong></p> <p>Maybe too late, but here's an implementation that might do what you need:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Scratch { class Program { static void Main(string[] args) { //var ids = new[] { 1000000012, 1000000021, 1000000013, 1000000022 }; var rand = new Random(); var ids = new int[rand.Next(20)]; for(var i = 0; i &lt; ids.Length; i++) { ids[i] = rand.Next(); } WriteIds(ids); var s = IdsToString(ids); Console.WriteLine("\nResult string is: {0}", s); var newIds = StringToIds(s); WriteIds(newIds); Console.ReadLine(); } public static void WriteIds(ICollection&lt;Int32&gt; ids) { Console.Write("\nIDs: "); bool comma = false; foreach(var id in ids) { if(comma) { Console.Write(","); } else { comma = true; } Console.Write(id); } Console.WriteLine(); } public static string IdsToString(ICollection&lt;Int32&gt; ids) { var allbytes = new List&lt;byte&gt;(); foreach(var id in ids) { var bytes = BitConverter.GetBytes(id); allbytes.AddRange(bytes); } var str = Convert.ToBase64String(allbytes.ToArray(), Base64FormattingOptions.None); return str.Replace('+', '-').Replace('/', '_').Replace('=', '.'); } public static ICollection&lt;Int32&gt; StringToIds(string idstring) { var result = new List&lt;Int32&gt;(); var str = idstring.Replace('-', '+').Replace('_', '/').Replace('.', '='); var bytes = Convert.FromBase64String(str); for(var i = 0; i &lt; bytes.Length; i += 4) { var id = BitConverter.ToInt32(bytes, i); result.Add(id); } return result; } } } </code></pre>
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    1. POCompressing big number (or string) to small value
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    1. USDaniel Pryden
    1. USDaniel Pryden
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    1. COThanks Daniel, Its C# language and numbers could be like: 1000000012,1000000021,1000000013,1000000022
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    2. CO87 chars to 44 chars That's great Daniel. Thanks a lot.
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    3. COOhh... not able to mark this and first posts as answer.
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