How to add two paragraphs in the same line using DocX.dll?

Question

 I would like to know if I can add 2 paragraphs in the same line using docX.dll. For example, I want my document to look like this:

 

First name: aaabbbccc_________________________Last name: aaabbbccc

Year of birth:aaaaaabbbbbbbccc_________________School:aaabbbcccc 

_ means spacing because I cannot space with spacebar. The words with a b and c are added words so I would like to make such spacing which would be the same for added words with various lenghts.