what is the behaviour abstract class and interface in c#?

This question already has an answer here:

What is the difference between an interface and abstract class? 32 answers

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You need explicit implementation of interface. The abstract class method method() implementation fulfill the need of implementation of abstract method of interface. So define the method of interface in the class childe but explicit implementation need to call the method of interface but not on class.

public interface NomiInterface
{
     void method();
}
public abstract class Nomi1
{
     public void method()
     {
          Console.WriteLine("abstract class method");
     }
}
public class childe : Nomi1, NomiInterface 
{ 
     void NomiInterface.method()
     {
          Console.WriteLine("interface method"); 
     }
}

You can test how you can call the method of abstract class and interface implementation present in childe

childe c = new childe();
NomiInterface ni = new childe();
ni.method();
c.method();

The output is

interface method
abstract class method

On the other hand if you do not do explicit interface implementation then the implementation given in childe class wont be call on childe or interface object.

public interface NomiInterface
{
    void method();
}
public abstract class Nomi1
{
    public void method()
    {
        Console.WriteLine("abstract class method");
    }
}
public class childe : Nomi1, NomiInterface
{
    void method() { Console.WriteLine("interface method"); }
}

Create object of class and interface as we did previously.

childe c = new childe();
NomiInterface ni = new childe();
ni.method();
c.method();

The output you will get

abstract class method
abstract class method

As an additional note you will take care of naming conventions for class / method names. You can find more about naming conventions here.

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