In VO, it was not so immediate to check the type of a variable. For objects, you need to use IsInstance(), there are functions like ValType() and UsualType other than specialized functions like IsString().

In .NET, things are much easier, fortunately.

if uValue is string
// do something
endif

The is operator works for all objects, and since in .NET every value type is an object, it works for all value types.