public static AzureEventStore OpenExistingForWriting(AzureStoreConfiguration config, EventStoreId container)
{
var blob = config.GetPageBlob(container.Name + "/stream.dat");
var check = AzureEventPointer.OpenWriteable(blob);
var offset = check.Read();
var length = blob.Properties.Length;
var store = AzureEventStoreChunk.OpenExistingForWriting(blob, offset, length);
return new AzureEventStore(container, store, check);
}