Question

How can we use callback function in C#?

Answer 1

I think what you are looking for is “delegates”. For example:

public MyClass
{
  public delegate void MyCallback(object sender, string MyArg);

  public string DoSomeWork(string Foo, MyCallback mcb)
  {
    mcb(this, Foo);
    return Foo;
  }
}

You can also use delegates to define events. For example, if you wanted an event in MyClass called “OnMyCallback”, define it using:

...
public event MyCallback OnMyCallback;
...

Cheers,
Adam