So I have some code that sets a property on an object.

    Expression<Func<string>> propertyToValidate; //passed in above

    var underlyingProperty = ((PropertyInfo)((MemberExpression)propertyToValidate.Body).Member);

    underlyingProperty.SetValue(objectUnderTest, excessivelyLargeNameValue);

And this works well, when propertyToValidate is something like "Car.Name or Fish.Color". Now I have situations where I want to pass nested paths, something like Car.Door.Handle.Name or Fish.Fin.Style or something of that sort. When I try to do that, I receive an error:

Object does not match target type.

I suspect it is trying to call the Name property on the Car, instead of the Handle. How can I modify my code to handle this 'nested' case?