// this is these 2 classes are re-used in almost all new applications
public class my_common_class_1(){
     protected string Company_Name = "Alteros GMBH";
     protected string Company_Site = "http://www.company_url.com";
}

public class my_common_class_2(){

     public bool license_check(){
          .........
     }
     public bool show_license_warning_alert(){
          .........
     }
}

//==================
//================== here is example application, what i want to achieve
//

public class NewApp {

    public NewApp{
       MessageBox("Hello, program is done by " + Company_Name);
    }

}