List Office 365 Users using C#

Question

I have created a domain for a <g class="gr_ gr_19 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del" data-gr-id="19" id="19">trail</g> account in Office <g class="gr_ gr_32 gr-alert gr_gramm gr_inline_cards gr_run_anim Style multiReplace" data-gr-id="32" id="32">365 .</g>

And I have created some users under my trail domain.

Now I need to fetch the created users not the contacts and that should be printed in my Visual Studio IDE using <g class="gr_ gr_150 gr-alert gr_gramm gr_inline_cards gr_run_anim Style multiReplace" data-gr-id="150" id="150">C# .</g>

How can I do that?

Need good explanation like step by step.