Getting started with Azure Cosmos DB .NET V3 SDK (GA)

CosmosGettingStarted.cs

using Microsoft.Azure.Cosmos;
using System;
using System.Threading.Tasks;

//Getting started with .NET SDK V3
namespace CosmosDotnetSDKGetStarted
{
    class Program
    {
        static async Task Main(string[] args)
        {
            // Create new CosmosClient to communiciate with Azure Cosmos DB
            using (var cosmosClient = new CosmosClient("endpoint", "key"))
            {
                // Create new database
                Database database = await cosmosClient.CreateDatabaseIfNotExistsAsync("databaseId");

                // Create new container
                Container container = await database.CreateContainerIfNotExistsAsync("containerId", "/PartitionKey");

                // Add item to container
                var todoItem = new TodoItem()
                {
                    id = Guid.NewGuid().ToString(),
                    PartitionKey = Guid.NewGuid().ToString(),
                    Task = "Get started with Azure Cosmos DB!"
                };
                var todoItemResponse = await container.CreateItemAsync<TodoItem>(todoItem, new PartitionKey(todoItem.PartitionKey));
            }
        }
    }
}