I see the exceptions and details of it but what I want to know is the state of the variables when that happen. So I think what I need is the intellitrace file to load into VS2015 right? Or am I missing something? I looked around and cannot find what I am looking for.
IntelliTrace does not capture values of local variables. As far as I know because of performance reasons. It only records values of actual parameters and values returned from methods. However, there is also a limitations here. If an actual parameter (or a return value) is of a reference type, IntelliTrace will not capture the whole object graph but only the first level. For example, let's assume that there is class A. It has 2 properties:
int IntProp { get; set; }
SomeClass ObjectProp { get; set; }
In this case IntelliTrace will allow us to only examine a value of IntProp. As to ObjectProp, we'll able to only see if it is set or not. It won't be possible to see properties of an instance of SomeClass.