public void Select(Selection selection)
{
int start = GetTrimmedValue(selection.Start, 0, Text.Length);
int length = GetTrimmedValue(selection.Length, 0, Text.Length - start);
m_Selection = new Selection(start, length);
}
protected internal TextBoxMemento(string text, int caretPostition, Selection selection)
{
m_Text = text;
m_CaretPostition = caretPostition;
m_Selection = selection;
s_UniqueIdCounter++;
m_UniqueId = s_UniqueIdCounter;
}