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copied!<p>Since Lightswitch is a Silverlight application, thus the ascii encoding is not available, <a href="https://stackoverflow.com/questions/10010840/encoding-ascii-not-available-in-silverlight-is-there-a-alternative">see this link.</a> It suggests for you to try using <code>Encoding.UTF8</code> instead.</p> <p>As for the Hashtable, it's also not supported in Silverlight. The alternative is to use <code>Dictionary <Tkey, TValue></code> instead. <a href="https://stackoverflow.com/questions/5011149/need-hashtable-and-arraylist">See this link.</a></p> <p>The updated code would look like this (untested code):</p> <pre><code> bool blnIsValid = false; int intValue = 0; int[] intWeights = { 8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2 }; if (p_strVin == null) { return false; } else if (p_strVin.Length != 17) { return blnIsValid; } p_strVin = p_strVin.ToUpper().Trim(); int intCheckValue = 0; char check = p_strVin[8]; char year = p_strVin[9]; if (!char.IsDigit(check) && check != 'X') { return blnIsValid; } else { if (check != 'X') { char[] d = new char[] { check }; var bytes = Encoding.UTF8.GetBytes(d); intCheckValue = int.Parse(Encoding.UTF8.GetString(bytes, 0, bytes.Length)); } else { intCheckValue = 10; } } Dictionary<char, int> replaceValues = new Dictionary<char, int>(); replaceValues.Add('A', 1); replaceValues.Add('B', 2); replaceValues.Add('C', 3); replaceValues.Add('D', 4); replaceValues.Add('E', 5); replaceValues.Add('F', 6); replaceValues.Add('G', 7); replaceValues.Add('H', 8); replaceValues.Add('J', 1); replaceValues.Add('K', 2); replaceValues.Add('L', 3); replaceValues.Add('M', 4); replaceValues.Add('N', 5); replaceValues.Add('P', 7); replaceValues.Add('R', 9); replaceValues.Add('S', 2); replaceValues.Add('T', 3); replaceValues.Add('U', 4); replaceValues.Add('V', 5); replaceValues.Add('W', 6); replaceValues.Add('X', 7); replaceValues.Add('Y', 8); replaceValues.Add('Z', 9); replaceValues.Add('1', 1); replaceValues.Add('2', 2); replaceValues.Add('3', 3); replaceValues.Add('4', 4); replaceValues.Add('5', 5); replaceValues.Add('6', 6); replaceValues.Add('7', 7); replaceValues.Add('8', 8); replaceValues.Add('9', 9); replaceValues.Add('0', 0); //Make sure it is a Valid Year if (!replaceValues.ContainsKey(year) && year != '0') { return blnIsValid; } //Make sure characters that are in the VIN are the ones allowed. for (int i = 0; i < p_strVin.Length; i++) { if (!replaceValues.ContainsKey(p_strVin[i])) { return false; } intValue += (intWeights[i] * ((int)replaceValues[p_strVin[i]])); } if ((intValue % 11) == intCheckValue) { blnIsValid = true; } return blnIsValid; </code></pre>

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