The .NET Workflow Engine

public static class WorkflowInit
{
    private static readonly Lazy<WorkflowRuntime> LazyRuntime =
        new Lazy<WorkflowRuntime>(InitWorkflowRuntime);

    public static WorkflowRuntime Runtime => LazyRuntime.Value;
    public static string ConnectionString { get; set; }

    private static WorkflowRuntime InitWorkflowRuntime()
    {
        // WorkflowRuntime.RegisterLicense("your license key text");

        var dbProvider = new MSSQLProvider(ConnectionString);
        var builder = new WorkflowBuilder<XElement>(
            dbProvider, new XmlWorkflowParser(), dbProvider
        ).WithDefaultCache();

        var runtime = new WorkflowRuntime()
            .WithBuilder(builder)
            .WithPersistenceProvider(dbProvider)
            .RunMigrations()
            .EnableCodeActions()
            .SwitchAutoUpdateSchemeBeforeGetAvailableCommandsOn()
            .AsSingleServer();

        runtime.WithPlugin(new BasicPlugin());

        runtime.OnProcessActivityChanged += (sender, args) => { };
        runtime.OnProcessStatusChanged   += (sender, args) => { };

        runtime.Start();
        return runtime;
    }
}