How to add parent node to existing xml file using c#?

[Krithiha]

I have a XML document having Student data, such as name, contact and program enrolled.
ex:
<Student>
<FirstName>Clai re</FirstName>
<LastName>Damen </LastName>
<AddressLine>4A , Lane7</AddressLine>
<City>NH</City>
<State>Alaska </State>
<ProgramEnrolle d>New Program</ProgramEnrolled >
<EnrollmentDate >2007-09-05</EnrollmentDate>
</Student>
I need to add parent nodes around the existing data, something like below.
<Student>
<Name>
<FirstName>Clai re</FirstName>
<LastName>Damen </LastName>
</Name>
<Contact>
<AddressLine>4A , Lane7</AddressLine>
<City>NH</City>
<State>Alaska </State>
</Contact>
<Program>
<ProgramEnrolle d>New Program</ProgramEnrolled >
<EnrollmentDate >2007-09-05</EnrollmentDate>
</Program>
</Student>

I have many sets of student data like this in the XML.
Thanks in advance.