// Methods
public void Add(string languageName)
{
Assert.ArgumentNotNullOrEmpty(languageName, "languageName");
for (var i = _list.Count - 1; i >= 0; i--)
{
if (string.Compare(_list[i], languageName, StringComparison.InvariantCultureIgnoreCase) == 0)
{
_list.Remove(i);
}
}
_list.AddAt(0, languageName);
while (_list.Count > Historylength)
{
_list.Remove(_list.Count - 1);
}
Save();
}