How to output a variable if "is" is false?

So I'm writing some code for a website with c#.

And I've used the "is" in my if and then created a variable for output like this:

if (test is Class1 item)
{
   <p>@item.title</p>

}
else if(!(test is Class1 item))
{
   <p>@item.title</p>

}

So my question is, how do I create a variable from type e.g. Class2 in the second if-else?

Thanks in advance!