//I am naming a class Wrapper //BaseClass is the name of class that's there in your vendor's dll public class Wrapper : BaseClass {//create constructors with no param or with params depending on what kind of constructors you have in vendor's dll and what you needpublic Wrapper () { base.BaseClass()}//create a function that you needpublic string function ReturnObject(){//do your stuff here//call methods from vendor's dll} }