[Solved] C# Abstract class two methods same name but with different inputs [closed]

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I suspect what you are looking for is:

public abstract class A
{
    public abstract int add(int n1, int n2);
    public abstract int add(int n1, int n2, int n3);
}

public abstract class B : A
{
    public override int add(int n1, int n2)
    {
        return (n1 + n2);
    }
}

public class C : B
{
    public override int add(int n1, int n2, int n3)
    {
        return (n1 + n2 + n3);
    }
}

Ultimately, C (which is not declared as abstract) needs to provide an implementation for both add variants (which it does by implementing one of them ‘directly’ and one of them via B).

If you want C to not inherit from B, but only provide one implementation – alas that is not possible if C is not abstract.

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solved C# Abstract class two methods same name but with different inputs [closed]