Multipul Inheritance in C#

Mans,
Without providing correct infromation, we can't assume any thing. It's not possible to define a class like below without class keyword and methods c an't put like X();Y();. It's giving compile time error to me.
Class A{
X();
Y();
}
Class B{
Z();
}

 
 

1.The structure is
Class A{
X();
Y();
}
Class B{
Z();
}
 
This 2 classes i shouldn't modifye and i need to give a single class to my client
The structure is
Class C{
X();
Y();
Z();
}
can it is possible.

Then, you need to tell about the 3rd party dll.

1. How they defined A and B.
2. If they haev any implementations, why you need to write logic.
3. Why can't you write your oen logic in your own new class? what's the dependency of redefine an existing 3rd party class

People u are not geting my point.
I already have 2 3rd party dlls with class A & B
and i want to impliment methods inside in in a single class or dll for my customer.
How do i do it?

Hi Sagar,
Class A and B are 3rd party DLLs.
I cant modifye those.
And my problem is i want to create a Dll for my customers which will have all the 3 methods.
X(),Y() and Z().
 

Hi,
In C# multiple inheritance achived by Interfaces not by classes.
but if u want to override the base class method in child class u can use polymorphism or if u want to change the signature of baseclass method in derived class(same name methods) use new keyword in derived class(i thing Shadowing).
In both the cases it won't effect base class memders.