I take inputs from users

In my index action i have:

```
    @b = Ece.find_by_code("#{params[:course]}")

```

I want to use the value stored in @b in my show action as well as in index action.

In my show action i want to do something like this:

```
<p><%= link_to "Forum", href="/courses/#{Course.find_by_courseCode(<%= @b %>).id}", :class=>"question_button round" %>

```

How can i setup @b to be global so that both these actions can use it

Note: Ece and Course are two different models