CustomerService.cs

public class CustomerService
{
    [CacheableResult(600)] // 600 seconds, 10 minutes cache policy
    public List<dynamic> ReturnCustomer()
    {
        var lstCustomer = new List<dynamic>();

        var customer = new Customer
        {
            Id = 1,
            Name = "Acme Inc",
            Email = "[email protected]"
        };

        var customer1 = new Customer
        {
            Id = 2,
            Name = "Marvel Inc",
            Email = "[email protected]"
        };

        lstCustomer.Add(customer);
        lstCustomer.Add(customer1);

        return lstCustomer;
    }

    [AffectedCacheableMethods("ReturnCustomer")]
    public bool UpdateCustomer()
    {
        return true;
    }
}