public class SmsSender : ISmsSender { public void SendSms(string recipient, string message) { // code to send message to recipient } }
public class TwilioSmsSender : ISmsSender { public void SendSms(string recipient, string message) { // code to send message using Twilio API to recipient } }In this example, we have created a class called TwilioSmsSender that also implements the ISmsSender interface. The SendSms method is implemented to use the Twilio API to send a message to the recipient specified in the parameter. Determining package library: The ISmsSender interface does not belong to any specific package or library in C#. It is commonly used in various messaging applications and can be implemented using any SMS sending library or API. For example, the TwilioSmsSender example above uses the Twilio API to send messages.