I am getting productTestInformation as `null` at set.

```
 public class ProductLog
    {
        public ProductTestInformation productTestInformation { get; set; }

        public int? ProductId { get { return productTestInformation .ProductId; } set { productTestInformation .ProductId = value; } }
        public string ProductName { get { return productTestInformation .ProductName; } set { productTestInformation .ProductName = value; } }

    }

```