csharp
1interface IContainer<T>
2{
3    T Value { get; set; }
4    bool HasValue { get; }
5}
6
7class Container<T> : IContainer<T>
8{
9    public T Value { get; set; }
10    public bool HasValue => Value != null;
11
12    public Container(T value)
13    {
14        Value = value;
15    }
16}
17
18// Usage
19IContainer<int> intContainer = new Container<int>(42);
20IContainer<string> strContainer = new Container<string>("Hello");