A derived class can add its own type parameters : Generic Hiearchy : Generic C# Examples

    
using  System;  
  
class  Gen<T>  {    
    T  ob;
        
    public  Gen(T  o)  {    
        ob  =  o;    
    }    
    
    public  T  getob()  {    
        return  ob;    
    }    
}    
  
class  Gen2<T,  V>  :  Gen<T>  {  
    V  ob2;  
  
    public  Gen2(T  o,  V  o2)  :  base(o)  {  
        ob2  =  o2;  
    }  
  
    public  V  getob2()  {  
        return  ob2;  
    }  
}  
    
class  MainClass  {    
    public  static  void  Main()  {    
        
        Gen2<string,  int>  x  =  new  Gen2<string,  int>("Value  is:  ",  99);    
  
        Console.Write(x.getob());  
        Console.WriteLine(x.getob2());  
    }    
}