Access RichTextContentControl Text from an AddIn in MS Word using C#

Question

I've created an AddIn for MS Word. There's a new tab and a button. I've added a new template document that has a RichTextContentControl in it.

 WORD_APP = Globals.ThisAddIn.Application;
            object oMissing = System.Reflection.Missing.Value;
            object oTemplate = "E:\\Sandbox\\TemplateWithFields\\TemplateWithFields\\TemplateWithFields.dotx";
            oDoc = WORD_APP.Documents.Add(ref oTemplate, ref oMissing, ref oMissing, ref oMissing);            

I want to get the text inside the RichTextContentControl. How can I access the text or content of a RichTextContentControl in my AddIn project?