Question: I am getting this error while creating a `public` method on a class for explicitly implementing the `interface`. I have a workaround: by removing the explicit implementation of `PrintName` method. But I am surprised why I am getting this error.

Can anyone explain the error?

Code for Library:

```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Test.Lib1
{

    public class Customer : i1 
    {
        public string i1.PrintName() //Error Here...
        {
            return this.GetType().Name + " called from interface i1";
        }
    }

    public interface i1
    {
        string PrintName();
    }

    interface i2
    {
        string PrintName();
    }
}

```

Code for Console Test Application:

```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Test.Lib1;

namespace ca1.Test
{
    class Program
    {
        static void Main(string[] args)
        {
            Customer customer = new Customer();
            Console.WriteLine(customer.PrintName());

            //i1 i1o = new Customer();
            //Console.WriteLine(i1o.printname());

            //i2 i2o = new Customer();
            //Console.WriteLine(i2o.printname());

        }
    }
}

```

Answer: 
You cannot use access modifiers when implementing interface explicitly. Member will be binded to the interface anyway, so it is no need to specify access modifier, because all interface members are always public, also all explicitly implemented members can be accessed only through member of interface type (see statichippo's answer for example).
This is an Explicit implementation, the default scope for the members of the interface is public, whereas it is private in case of a class, ergo, there is no need to use the Public modifier because when we call that method it would be called with the reference of the interface only.

According to "[MSDN Explicit Interface Implementation](https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/interfaces/explicit-interface-implementation)" the functions that implement explicit interfaces are never explicitly defined public. They are public by default. It would be meaningless to define them otherwise.