//Define the Context Object.

//The Context class (object) stores the application data and applies the sort strategy selected against the application data.
public class Context
{
private List<string> _list = new List<string>();
private IStrategy _sortStrategy;

public Context(IStrategy sortStrategy)
{
_sortStrategy = sortStrategy;
}

public void AddItem(string name)
{
_list.Add(name);
}

public void SetSortStrategy(IStrategy sortStrategy)
{
_sortStrategy = sortStrategy;
}

public void Sort()
{
_sortStrategy.Sort(_list);
foreach (string name in _list)
{
Console.WriteLine(name);
}
}
}