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copied!<ol> <li><p><a href="http://msdn.microsoft.com/fr-fr/library/system.io.stream.read.aspx" rel="nofollow">http://msdn.microsoft.com/fr-fr/library/system.io.stream.read.aspx</a></p> <p>buf is a byte[] array, which, once the method has returned, contains the data that you just Read. BUFFER_SIZE is the size of the data you want to read. If you want to read a single byte, BUFFER_SIZE=1. If you want to read one kilobyte of data, BUFFER_SIZE=1024, etc. Note that, if you ask for a too big buffer (e.g. asking for 1MB when the data is 1KB), it won't matter much. It will read a KB, and return.</p></li> <li><p>Your final string should look like this, unless XE.com decides to change it: </p> <p>XE.com: USD to EUR rate: 1.00 USD = 0.716372 EUR</p> <p>You can use the String methods to strip things you don't need: The whole first part </p> <p><code>(XE.com: USD to EUR rate:)</code> </p> <p>can be easily removed by just building a string with your data:</p> <p><code>(string header = "XE.com: {0} to {1} rate:", currency1, currency2)</code></p> <p>,then calling <code>String.Replace(header, '')</code>. From there, you can call <code>String.Split('=')</code>, splitting at the '=' sign, then removing the currency part from the splitted strings (again, <code>String.Replace()</code>) and finally calling <code>Double.TryParse()</code></p></li> </ol> <p>Note: codesparkle's method is way easier, because you basically skip step 1. But XE.com are not providing an API: You have no guarantee the returned string will be valid, or won't change someday in the future.</p> <p>OK, here's some code:</p> <pre><code>private double GetConvertedCurrencyValue(string inputCurrency, string outputCurrency, double value) { string request = String.Format(http://www.xe.com/ucc/convert.cgi?Amount={0}&From={1}&To={2}", value, inputCurrency, outputCurrency); System.Net.WebClient wc = new System.Net.WebClient(); string apiResponse = wc.DownloadString(request); // This is a blocking operation. wc.Dispose(); /* Formatting */ // Typical response: "XE.com: curr1 to curr2 rate: x curr1 = y curr2" // The first part, up until "x curr1" is basically a constant string header = String.Format("XE.com: {0} to {2} rate:" inputCurrency, outputCurrency); // Removing the header // The response now looks like this: x curr1 = y curr2 apiResponse = apiResponse.Replace(header, ""); // Let's split the response at '=', to retrieve the right part string outValue = apiResponse.Split('=')[1]; // Getting rid of the 'curr2' part outValue = outValue.Replace(outputCurrency, ""); return Double.Parse(outValue, System.Globalization.CultureInfo.InvariantCulture); } </code></pre>

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