title: Select and change value of a node from ubl-tr xml
body: <p>I want to selct and change value of a node of the below xml in c#. This is a ubl-tr xml sample. Suppose that, I want to change the value of cbc:UUID.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt;
  &lt;?xml-stylesheet type="text/xsl" href="general.xslt"?&gt;
  &lt;Invoice xsi:schemaLocation="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2 ../xsdrt/maindoc/UBL-Invoice-2.1.xsd" 
  xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" 
  xmlns:n4="http://www.altova.com/samplexml/other-namespace" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" 
  xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" 
  xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2"&gt;
    &lt;ext:UBLExtensions&gt;
      &lt;ext:UBLExtension&gt;
        &lt;ext:ExtensionContent&gt;
          &lt;n4:auto-generated_for_wildcard/&gt;
        &lt;/ext:ExtensionContent&gt;
      &lt;/ext:UBLExtension&gt;
    &lt;/ext:UBLExtensions&gt;
    &lt;cbc:UBLVersionID&gt;2.1&lt;/cbc:UBLVersionID&gt;
    &lt;cbc:CustomizationID&gt;TR1.2&lt;/cbc:CustomizationID&gt;
    &lt;cbc:ProfileID&gt;TEMELFATURA&lt;/cbc:ProfileID&gt;
    &lt;cbc:ID&gt;GIB20090000000001&lt;/cbc:ID&gt;
    &lt;cbc:CopyIndicator&gt;false&lt;/cbc:CopyIndicator&gt;
    &lt;cbc:UUID&gt;F47AC10B-58CC-4372-A567-0E02B2C3D479&lt;/cbc:UUID&gt;
    &lt;cbc:IssueDate&gt;2009-01-05&lt;/cbc:IssueDate&gt;
    &lt;cbc:IssueTime&gt;14:42:00&lt;/cbc:IssueTime&gt;
    &lt;cbc:InvoiceTypeCode&gt;SATIS&lt;/cbc:InvoiceTypeCode&gt;
    &lt;cbc:DocumentCurrencyCode&gt;TRY&lt;/cbc:DocumentCurrencyCode&gt;
    &lt;cbc:LineCountNumeric&gt;1&lt;/cbc:LineCountNumeric&gt;
  &lt;/Invoice&gt;
  </code></pre>