How to Add Choices to Existing Choice Field Using CSOM in SharePoint 2013 Online

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Code Snippet

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Security;
using System.Text;
using System.Threading.Tasks;
using Microsoft.SharePoint.Client;
namespace CSOMOffice365
{
class Program
{
static void Main(string[] args)
{
string userName = "[email protected]";
Console.WriteLine("Enter your password.");
SecureString password = GetPassword();
// ClienContext - Get the context for the SharePoint Online Site
// SharePoint site URL - https://c986.sharepoint.com
using (var clientContext = new ClientContext("https://c986.sharepoint.com"))
{
// SharePoint Online Credentials
clientContext.Credentials = new SharePointOnlineCredentials(userName, password);
// Get the SharePoint web
Web web = clientContext.Web;
// Get the list by Title
List list = web.Lists.GetByTitle("Custom");
// Get a specific field by Title
Field field = list.Fields.GetByTitle("Choice");
FieldChoice fieldChoice = clientContext.CastTo<FieldChoice>(field);
clientContext.Load(fieldChoice);
// Execute the query to the server
clientContext.ExecuteQuery();
// Add the choice field values
List<string> options = new List<string>(fieldChoice.Choices);
options.Add("Option1");
options.Add("Option2");
options.Add("Option3");
fieldChoice.Choices = options.ToArray();
// Update the choice field
fieldChoice.Update();
// Execute the query to the server
clientContext.ExecuteQuery();
// Display all the choices
foreach (string option in fieldChoice.Choices)
{
Console.WriteLine(option);
}
Console.ReadLine();
}
}
private static SecureString GetPassword()
{
ConsoleKeyInfo info;
//Get the user's password as a SecureString
SecureString securePassword = new SecureString();
do
{
info = Console.ReadKey(true);
if (info.Key != ConsoleKey.Enter)
{
securePassword.AppendChar(info.KeyChar);
}
}
while (info.Key != ConsoleKey.Enter);
return securePassword;
}
}
}