Program.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.Azure.Storage;
using Microsoft.Azure.Storage.Blob;
using Microsoft.Azure.Storage.Shared.Protocol;
using Pulumi;
using Pulumi.Azure.Core;
using Pulumi.Azure.Storage;

class Program
{
    static Task<int> Main()
    {
        return Deployment.RunAsync(() => {

            // Create an Azure Resource Group
            var resourceGroup = new ResourceGroup("mystaticsite");

            // Create an Azure Storage Account
            var storageAccount = new Account("mysite", new AccountArgs
            {
                ResourceGroupName = resourceGroup.Name,
                EnableHttpsTrafficOnly = true,
                AccountReplicationType = "LRS",
                AccountTier = "Standard",
                AccountKind = "StorageV2",
                AccessTier = "Hot",
            });
                // We can't enable static sites using Pulumi (it's not exposed in the ARM API).
                // Therefore we have to invoke the Azure SDK from within the Pulumi code to enable the static sites 
                // The code in the Apply method must be idempotent.
                if (!Deployment.Instance.IsDryRun)
                    storageAccount.PrimaryBlobConnectionString.Apply(async v => await EnableStaticSites(v) );
            
            // Export the Web address string for the storage account
            return new Dictionary<string, object>
            {
                { "Site-Url", storageAccount.PrimaryWebEndpoint },
            };
        });


        static async Task EnableStaticSites(string connectionString)
        {
            CloudStorageAccount sa = CloudStorageAccount.Parse(connectionString);
           
            var blobClient = sa.CreateCloudBlobClient();
            ServiceProperties blobServiceProperties = new ServiceProperties();
            blobServiceProperties.StaticWebsite = new StaticWebsiteProperties
            {
                Enabled = true,
                IndexDocument = "index.html",
               // ErrorDocument404Path = "404.html"
            };
            await blobClient.SetServicePropertiesAsync(blobServiceProperties);

        }
    }
}