public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddEnyimMemcached(Configuration.GetSection("enyimMemcached"));
	// or
	//services.AddEnyimMemcached(options => someSetupAction(options));
    }
    
    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    { 
        app.UseEnyimMemcached();
    }
}

public class TabNavService
{
    private ITabNavRepository _tabNavRepository;
    private IMemcachedClient _memcachedClient;

    public TabNavService(
        ITabNavRepository tabNavRepository,
        IMemcachedClient memcachedClient)
    {
        _tabNavRepository = tabNavRepository;
        _memcachedClient = memcachedClient;
    }

    public async Task<IEnumerable<TabNav>> GetAll()
    {
		var cacheKey = "aboutus_tabnavs_all";
        var result = await _memcachedClient.GetAsync<IEnumerable<TabNav>>(cacheKey);
        if (!result.Success)
        {
            var tabNavs = await _tabNavRepository.GetAll();
            await _memcachedClient.AddAsync(cacheKey, tabNavs, 300);
            return tabNavs;
        }
        else
        {
            return result.Value;
        }
    }
}

public class CreativeService
{
    private ICreativeRepository _creativeRepository;
    private IDistributedCache _cache;

    public CreativeService(
        ICreativeRepository creativeRepository,
        IDistributedCache cache)
    {
        _creativeRepository = creativeRepository;
        _cache = cache;
    }

    public async Task<IList<CreativeDTO>> GetCreatives(string unitName)
    {
        var cacheKey = $"creatives_{unitName}";
        IList<CreativeDTO> creatives = null;

        var creativesJson = await _cache.GetStringAsync(cacheKey);
        if (creativesJson == null)
        {
            creatives = await _creativeRepository.GetCreatives(unitName)
                    .ProjectTo<CreativeDTO>().ToListAsync();

            var json = string.Empty;
            if (creatives != null && creatives.Count() > 0)
            {
                json = JsonConvert.SerializeObject(creatives);
            }
            await _cache.SetStringAsync(
                cacheKey, 
                json, 
                new DistributedCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromMinutes(5)));
        }
        else
        {
            creatives = JsonConvert.DeserializeObject<List<CreativeDTO>>(creativesJson);
        }

        return creatives;
    }
}