Include an example to support Callbacks and promises at the same time about c-sharp-promise HOT 3 CLOSED

// Method returning a promise
public IPromise<T> Get<T>(string url) 
{
    var promise = new Promise<T>();
    AsyncOperation<T>(url, (err, res) => {
        if (err != null)
        {
            promise.Reject(err);
        }
        else
        {
            promise.Resolve(res);
        }
    });
    return promise;
}

// Method that lets us use a callback
public void Get<T>(string url, Action<Exception, T> callback)
{
    Get(url)
        .Then(value => callback(null, value))
        .Catch(ex => callback(ex, null));
}

public IPromise<T> Get<T>(string url, Action<Exception, T> callback = null){
  var promise = new Promise<T>();
  AsyncOperation<T>(url, (err, res) => {
    if(err != null){
      promise.Reject(err);
    }
    else{
      promise.Resolve(res);
    }
    if(callback != null) callback(err, res);
  });
  return promise;
}

//Callbacks
Get<string>("www.nicholls.co/hello", (errHello, resHello) => {
  Console.Write(resHello); //HELLO
  Get<string>("www.nicholls.co/world", (errWorld, resWorld) => {
    Console.Write(" " + resWorld); //HELLO WORLD
  });
});
//Promises
Get<string>("www.nicholls.co/hello").Then(res => {
  Console.Write(res); //HELLO
  return Get<string>("www.nicholls.co/world");
}).Then(res => {
  Console.Write(" " + res); //HELLO WORLD
}).Catch(err => {
  Console.Write(err.Message);
});