pass an Object to external .dll funcion and get a changed Object

a .dll was just an example of external class i was using... i know its a reference who is passed, but i dont get that object changed :( manged that problem a few weeks ago, dont remeber the line. if some one is interested - mail me... [email protected] it was smth wrong with local variable types in that .dll class.. cant remember thanks for reply anyway!

This is a managed DLL, isn't it? So why does it make a difference if it is a DLL at all? A class is a class. The class may create a new instance of the object by making the function result or an OUT parameter be a TextBox. If you want to modify the instance itself, you can simply pass the object itself as a parameter. Because it is a reference type, the object you passed in will be modified directly by the function. If you were to pass a value type such as an integer, you could either box it and pass it to an object parameter and unbox it to get the value back, or use a REF parameter to have the function modify it directly.