public void RemoveBoat()
{
int[] result = Docks
.Select((b, i) => b != null && b.Docked == false ? i : -1)
.Where(i => i != -1)
.ToArray();
foreach (var item in result)
{
Docks.SetValue(null, item);
}
Boats
.RemoveAll(b => b != null && b.Docked == false);
}