How to make C# write commands in Microsoft Powershell?

Im trying to run ulozto-downloader app with Microsoft Powershell with C#. But Im not very good at this part of C#. I want to open Microsoft PowerShell and write this command: ulozto-downloader --parts 50 "URL" then wait till it finishes and write another one command but with different URL. URLs can be pre-stored in code. Do you have any solution?