appwrite/docs/examples/1.4.x/server-dotnet/examples/functions/create.md

using Appwrite;
using Appwrite.Services;
using Appwrite.Models;

var client = new Client()
    .SetEndPoint("https://cloud.appwrite.io/v1") // Your API Endpoint
    .SetProject("5df5acd0d48c2") // Your project ID
    .SetKey("919c2d18fb5d4...a2ae413da83346ad2"); // Your secret API key

var functions = new Functions(client);

Function result = await functions.Create(
    functionId: "[FUNCTION_ID]",
    name: "[NAME]",
    runtime: "node-18.0");