This article demonstrates how to add, update and remove speaker notes in PowerPoint using the NotesSlidesApi interface provided by Spire.Cloud.PowerPoint.

Add speaker notes

using Spire.Cloud.Powerpoint.Sdk.Client;
using Spire.Cloud.Powerpoint.Sdk.Api;

namespace AddSpeakerNotes
{
    class Program
    {
        static string appId = "APP ID";
        static string appKey = "APP Key";
        static string baseUrl = "https://api.cloudxdocs.com";
        //Create a Configuration instance based on your AppID and AppKey
        static Configuration configuration = new Configuration(appId, appKey, baseUrl);
        //Create a NotesSlidesApi instance
        static NotesSlidesApi notesSlidesApi = new NotesSlidesApi(configuration);
        static void Main(string[] args)
        {
            //Specify the input document
            string name = "sample.pptx";
            //Specify the index of the slide
            int slideIndex = 0;
            //Specify the text of speaker notes
            string note = "Tips for making effective presentations.";
            //Specify the password used to open the document, and it's "null" if nothing
            string password = null;
            //Use the 2G storage provided by E-iceblue, and it's "null" by default
            string storage = null;
            //Specify the folder storing the input document, and it's "null" if nothing
            string folder = "input";

            //Call AddNotesSlide method to add speaker notes to the slide
            notesSlidesApi.AddNotesSlide(name, slideIndex, note, password, folder, storage);
        }
    }
}

Output:

Update speaker notes

using Spire.Cloud.Powerpoint.Sdk.Client;
using Spire.Cloud.Powerpoint.Sdk.Api;

namespace UpdateSpeakerNotes
{
    class Program
    {
        static string appId = "APP ID";
        static string appKey = "App Key";
        static string baseUrl = "https://api.cloudxdocs.com";
        //Create a Configuration instance based on your AppID and AppKey
        static Configuration configuration = new Configuration(appId, appKey, baseUrl);
        //Create a NotesSlidesApi instance
        static NotesSlidesApi notesSlidesApi = new NotesSlidesApi(configuration);
        static void Main(string[] args)
        {
            //Specify the input document
            string name = "sample.pptx";
            //Specify the index of the slide
            int slideIndex = 0;
            //Specify the text of speaker notes
            string note = "Updated speaker notes";
            //Specify the password used to open the document, and it's "null" if nothing
            string password = null;
            //Use the 2G storage provided by E-iceblue, and it's "null" by default
            string storage = null;
            //Specify the folder storing the input document, and it's "null" if nothing
            string folder = "input";          

            //Call SetNotesSlide method to update text of speaker notes in the slide
            notesSlidesApi.SetNotesSlide(name, slideIndex, note, password, folder, storage);
        }
    }
}

Output:

Remove speaker notes

using Spire.Cloud.Powerpoint.Sdk.Client;
using Spire.Cloud.Powerpoint.Sdk.Api;

namespace RemoveSpeakerNotes
{
    class Program
    {
        static string appId = "APP ID";
        static string appKey = "APP Key";
        static string baseUrl = "https://api.cloudxdocs.com";
        //Create a Configuration instance based on your AppID and AppKey
        static Configuration configuration = new Configuration(appId, appKey, baseUrl);
        //Create a NotesSlidesApi instance
        static NotesSlidesApi notesSlidesApi = new NotesSlidesApi(configuration);
        static void Main(string[] args)
        {
            //Specify the input document
            string name = "sample.pptx";
            //Specify the index of the slide
            int slideIndex = 0;
            //Specify the password used to open the document, and it's "null" if nothing
            string password = null;
            //Use the 2G storage provided by E-iceblue, and it's "null" by default
            string storage = null;
            //Specify the folder storing the input document, and it's "null" if nothing
            string folder = "input";            

            //Call DeleteNotesSlide method to remove speaker notes in the slide
            notesSlidesApi.DeleteNotesSlide(name, slideIndex, password, folder, storage);
        }
    }
}

Output: