Convert Class Runtime In CType In Second Parameter?

1. I have three classes. Now I want to know how do I convert object to my class runtime?

for example,
Dim obj as New Object
obj = CType( MyPassedObject, Class1 )

Now, in above code, MyPassedObject can be Class1 or Class2 or Class3 but it is passed as Object. So is there any way that I can convert into CType as per the type of that object, directly to that class? I mean, I can pass object name into parameter and write down CASE statement here to convert to that class but I do not want to write down Case statement for each of my class, so just want to know is it possible anyway?

I mean just for example, Can I do something like obj = CType( MyPassedObject, GetObject('Class1') or any other way?

2. Now for this obj, I am getting properties runtime and setting values and then updating.

for example,

Dim PropertyInfo As Reflection.PropertyInfo() = obj.GetType.GetProperties()

Now, Will it work fine if obj has been declared as Object and then I typeCast it runtime and then I get properties and set its values. Will it work if obj's variable type is Object or it must be that class type itself.