Word add-in - join all lines of text into one

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MS-Word

I have a word file:

paragraph1
paragraph2
paragraph3
paragraph4
paragraph5

I want to Join all lines of text into one:
paragraph1. paragraph2.paragraph3.paragraph4.paragraph5
Help me. Thanks all!!!

What I have tried:

Word.Range rang = Globals.ThisAddIn.Application.ActiveDocument.Range();
rang = rang.Text.Replace("\n", " ");