How to find sections and Subsections present in Word Document

How to find sections and Subsections present in Word Document

Ex:

Assume document with the following section and sub sections

1   Example
      1.1      Example
      1.2      Example
            1.2.1      Example
2      Example
      2.1      Example
            2.1.1      Example
•      Level 1
o      Level 2
      Level 3
      Level4
            2.1.2       Example
                  2.1.2.1      Example
                        2.1.2.1. a      Example
                              2.1.2.1. a.1 Example



How to find count of each section have how many subsections Using C# or ASP,net?