private string LookupPrefix()
{
if (!string.ReferenceEquals(namespaceUri, null))
{
string lookupPrefix = null;
if (Element != null)
{
lookupPrefix = Element.LookupPrefix(namespaceUri);
}
else if (RootElement != null)
{
lookupPrefix = RootElement.LookupPrefix(namespaceUri);
}
return(lookupPrefix);
}
else
{
return(null);
}
}