title: Modifying two fields in .XML file
body: <p>I have a XML file which looks like:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="no" ?&gt;
  &lt;UFCC xmlns="http://actel.com/sweng/afi"&gt;
    &lt;Region name="Region_0_0"&gt;
      &lt;content&gt;
       &lt;static_data&gt;
       &lt;fixed&gt;
          &lt;value&gt;11111111111111111111111111111111&lt;/value&gt;
          &lt;type&gt;HEX&lt;/type&gt;
        &lt;/fixed&gt;
        &lt;/static_data&gt;
    &lt;/content&gt;
      &lt;region_start_word&gt;0&lt;/region_start_word&gt;
      &lt;number_of_word&gt;16&lt;/number_of_word&gt;
      &lt;simulation_value&gt;
        &lt;value&gt;11111111111111111111111111111111&lt;/value&gt;
        &lt;type&gt;HEX&lt;/type&gt;
      &lt;/simulation_value&gt;
    &lt;/Region&gt;
    &lt;Region name="Region_1_0"&gt;
      &lt;content&gt;
        &lt;static_data&gt;
        &lt;fixed&gt;
          &lt;value&gt;BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB&lt;/value&gt;
          &lt;type&gt;HEX&lt;/type&gt;
        &lt;/fixed&gt;
        &lt;/static_data&gt;
      &lt;/content&gt;
        &lt;region_start_word&gt;16&lt;/region_start_word&gt;
        &lt;number_of_word&gt;16&lt;/number_of_word&gt;
      &lt;simulation_value&gt;
        &lt;value&gt;BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB&lt;/value&gt;
        &lt;type&gt;HEX&lt;/type&gt;
      &lt;/simulation_value&gt;
    &lt;/Region&gt;
    &lt;Program_Pages/&gt;
  &lt;/UFCC&gt;
  </code></pre>
  
  <p>I'm trying to change value fields "11111111111111111111111111111111" to "A...A". I have tried this with Xml.Linq and using examples found online, from which none seem to work. </p>
  
  <p>How can I modify these fields?</p>
  
  <p>Sorry about the formatting, I'm not that familiar with proper XML formatting and the source file is written in single line.</p>