Declare all Methods of inherited interface within interface?

Question

Do you need to redeclare all methods declared in the inherited interface in a derived interface?

Example:

public interface IBoo
{
    void DoSomething();
}

public interface IFoo : IBoo
{
    string SayHello();
}

Or would I have to do this:-

public interface IFoo : IBoo
{
    void DoSomething();

    string SayHello();
}

Answer 1

Do you need to redeclare all methods declared in the inherited interface in your interface?

No. Actually this is the concept of inheritance. All the methods that are declared in the base interface will be inherited to the derived.