C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;

interface A{
	Object foo();
}
 
interface B{
	String foo();
}
 
class C : A, B{
	public String foo(){
		return "Foo";
	}
}

public class Program
{
    public static void Main()
    {
		C c = new C();
		Console.WriteLine(c.foo());
	}
}

​x
 
using System;
​
interface A{
    Object foo();
}
 
interface B{
    String foo();
}
 
class C : A, B{
    public String foo(){
        return "Foo";
    }
}
​
public class Program
{
    public static void Main()
    {
        C c = new C();
        Console.WriteLine(c.foo());
    }
}

Compilation error (line 11, col 11): 'C' does not implement interface member 'A.foo()'. 'C.foo()' cannot implement 'A.foo()' because it does not have the matching return type of 'object'.

Last Run:	2:24:28 am
Compile:	0.006s
Execute:	0s
Memory:	0b
CPU:	0s

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