public void SetProjectExtensions (string section, string value)
{
XmlElement elem = doc.DocumentElement ["ProjectExtensions", MSBuildProject.Schema];
if (elem == null) {
elem = doc.CreateElement (null, "ProjectExtensions", MSBuildProject.Schema);
doc.DocumentElement.AppendChild (elem);
}
XmlElement sec = elem [section];
if (sec == null) {
sec = doc.CreateElement (null, section, MSBuildProject.Schema);
elem.AppendChild (sec);
}
sec.InnerXml = value;
}