How to Disable Header section in Word Doc for editing using word interop c#

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C#3.5

MS-Word

I have Test.dotx file having one picturebox and 2 text fields in Header section (Header-footer).

When I create Test.DocX from Test.dotx file, i want Header part of file to be locked for editing i.e. user must not be able to write or delete from header section of document(Test.DocX).

I am using word.interop for this purpose. I have given lock to Content Controls in header via.

cc.LockContentControl = true;
cc.LockContents = true;


This disables only controls but other area in header remains Editable. I want to lock whole header section.