In XML, what are the nodes with question marks called, and how do I add them in C#?

Here's an example of an XML file created in InfoPath:

  <?xml version="1.0" encoding="UTF-8"?>
  <?mso-infoPathSolution solutionVersion="1.0.0.1" productVersion="12.0.0" PIVersion="1.0.0.0" href="file:///C:\Metastorm\Sample%20Procedures\InfoPath%20samples\Template1.xsn" name="urn:schemas-microsoft-com:office:infopath:Template1:-myXSD-2010-07-21T14-21-13" ?>
  <?mso-application progid="InfoPath.Document" versionProgid="InfoPath.Document.2"?>
  <my:myFields xmlns:my="http://schemas.microsoft.com/office/infopath/2003/myXSD/2010-07-21T14:21:13" xml:lang="en-us">
    <my开发者_如何转开发:field1>hello</my:field1>
    <my:field2>world</my:field2>
  </my:myFields>

What are those top 3 nodes with the question mark called... and how do I create them in C#?

So far I have this:

  XmlDocument xmldoc;
  XmlDeclaration xmlDeclaration;

  xmldoc=new XmlDocument();
  xmlDeclaration = xmldoc.CreateNode(XmlNodeType.XmlDeclaration, "", "") as XmlDeclaration;
  xmlDeclaration.Encoding = "UTF-8";
  xmldoc.AppendChild(xmlDeclaration);

This works fine for the top XML declaration node , but how do I create the next two?

Thanks in advance :)

These are called processing instructions. Add 'em using XmlDocument.CreateProcessingInstruction.

Those are called processing instructions. You can use the XmlProcessingInstruction class to interact with them in an XmlDocument.

As with most elements defined within an XmlDocument, you cannot instantiate it directly; you must use the appropriate factory method on XmlDocument (CreateProcessingInstruction in that particular case.)

Thanks for explaining that these are processing instructions. Using CreateProcessingInstruction as suggested, here is the solution:

  xmlPi = xmldoc.CreateProcessingInstruction("mso-infoPathSolution", "solutionVersion=\"1.0.0.1\" productVersion=\"12.0.0\" PIVersion=\"1.0.0.0\" href=\"file:///C:\\Metastorm\\Sample%20Procedures\\InfoPath%20samples\\Template1.xsn\" name=\"urn:schemas-microsoft-com:office:infopath:Template1:-myXSD-2010-07-21T14-21-13\"");
  xmldoc.AppendChild(xmlPi);