C#-code Copy text from .txt to Clipboard (MacroRecorder)

I work for a logistics company. And we use macro to complete several non-added value task and to update and sent to email reports. I'm setting up a Macro script with Macro Recorder and I need help with some C#-code. I need the script to clear my clipboard, take all the text from a .txt file in my local directory, and load it into my clipboard. My personal attempts lead to a inconsistent result that sometimes gave me a exception error. So I need help to get a C#-code that doesn't give me an error. My macro script essentially take imports a lists of emails in a .txt file and paste it into a email recipient field in Microsoft Outlook. It's easier that way to update a .txt file than the macro script. This code MUST contain a class named "Program" with a static method "Main" Payment will be done upon successful testing in Macro Recorder script ([login to view URL]).