将Textarea发布到Controller（当前为null） - MVC

I'm creating a website where the user will fill in a textarea (in response to a question) and then press next. When they press next, the textarea will be submitted to the controller and the next question will be retrieved (I'll also store the answer in a cookie). Unfortunately, when I run the code in debug I've realized that the textarea is not being submitted b/c the parameter is null. I've tried to figure it out and I've looked around and I seem to be doing it properly. Hopefully it's an easy fix. Thanks so much for your time!I'm creating a website where the user will fill