Could you confirm you tried :

@foreach (var item in Model) {@(item.@operator)}

I'm using a List<Test> model with two entries and using "A" and "B" for the operator value. It does show AB on my view. This is really MVC or WebPages? Not sure what could make the difference it still fails on your side and which the same error message.

Edit:

public string @operator { get; set; }

I am also able to modified my class to use _operator

No, @operator is how to name a property operator despite being a C# keyword. From the link I posted earlier :

"Keywords are predefined, reserved identifiers that have special meanings to the compiler. They cannot be used as identifiers in your program unless they include @ as a prefix. For example, @if is a valid identifier, but if is not because if is a keyword."

AFAIK this is just part of the syntax if using System.Reflection you should see the property name is really just "operator".