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copied!<p>When you use concatenation such as </p> <pre><code>str_orderbycity += ","; </code></pre> <p>A new string is created (if not already existing in <a href="http://brainspeex.wordpress.com/2011/10/30/string-pooling-in-net-c/" rel="nofollow">string intern pool</a>).</p> <p><a href="http://msdn.microsoft.com/en-us/library/system.text.stringbuilder.aspx" rel="nofollow">StringBuffer</a> avoids those intermediate strings by using maintaining <code>char array</code> only.</p> <p><code>StringBuffer</code> has its costs/overheads so it is not always efficient than <code>String</code> concatenation.</p> <p>From <a href="http://msdn.microsoft.com/en-us/library/system.text.stringbuilder.aspx" rel="nofollow">String Builder Performance consideration - MSDN</a></p> <blockquote> <p>The performance of a concatenation operation for a String or StringBuilder object depends on the frequency of memory allocations.<br> A String concatenation operation always allocates memory, whereas a StringBuilder concatenation operation allocates memory only if the StringBuilder object buffer is too small to accommodate the new data.<br> Use the String class if you are concatenating a fixed number of String objects. In that case, the compiler may even combine individual concatenation operations into a single operation.<br> Use a StringBuilder object if you are concatenating an arbitrary number of strings; for example, if you're using a loop to concatenate a random number of strings of user input.</p> </blockquote>

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