• Fadeout unused variable names (#1324, PR: #3733)
• Updated debugger (PR: #3729)
• Fixed not supported exception when trying to decompile a BCL assembly on Mono. For now we do not try to resolve implementation assembly from a ref assembly (PR: omnisharp-roslyn/#1767)
• Added support for generic classes in test runner (#3722, PR: omnisharp-roslyn/#1768)
• Improved autocompletion performance (PR: omnisharp-roslyn/#1761)
• Move to Roslyn's .editorconfig support (omnisharp-roslyn/#1657, PR: omnisharp-roslyn/#1771)
• Fully update CompilationOptions when project files change (PR: omnisharp-roslyn/#1774)

Metro JS is a JavaScript plugin for jQuery developed to easily enable Metro interfaces on the web
This release focuses on Live Tiles, the Application Bar and Theming

In summary, the most important issues here are:

• The Aggregate’s main task is to protect invariants (business rules, the boundary of immediate consistency)
• In a multi-threaded environment, when multiple threads are running simultaneously on the same Aggregate, a business rule may be broken
• A way to solve concurrency conflicts is to use Pessimistic or Optimistic concurrency techniques
• Pessimistic Concurrency involves the use of a database transaction and a locking mechanism. In this way, requests are processed one after the other, so basically concurrency is lost and it can lead to deadlocks.
• Optimistic Concurrency technique is based on versioning database records and checking whether the previously loaded version has not been changed by another thread.
• Entity Framework Core supports Optimistic Concurrency. Pessimistic Concurrency is not supported
• The Aggregate must always be treated and versioned as a single unit
• Domain events are an indicator, that state was changed so Aggregate version should be changed as well 

public class AggregateRootBase : Entity, IAggregateRoot
{
    private int _versionId;

    public void IncreaseVersion()
    {
        _versionId++;
    }
}

internal sealed class OrderEntityTypeConfiguration : IEntityTypeConfiguration<Order>
{
    public void Configure(EntityTypeBuilder<Order> builder)
    {
        builder.Property("_versionId").HasColumnName("VersionId").IsConcurrencyToken();
 
        //...
    }
}

var order = await _ordersContext.Orders.FindAsync(orderId);
order.AddOrderLine(request.ProductCode); 
var domainEvents = DomainEventsHelper.GetAllDomainEvents(order);
if (domainEvents.Any())
{
    order.IncreaseVersion();
}
await _ordersContext.SaveChangesAsync();