using System; using System.Collections.Generic; using System.Linq; using System.Windows.Forms; namespace FileSystemDatabase { class UndoRedo { private RichTextBox m_rtb; public UndoRedo(RichTextBox rtb) { m_rtb = rtb; } public void Undo() { string original = m_rtb.Text; do { m_rtb.Undo(); } while (original == m_rtb.Text && m_rtb.CanUndo); } public void Redo() { string original = m_rtb.Text; do { m_rtb.Redo(); } while (original == m_rtb.Text && m_rtb.CanRedo); } } }
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10 PRINT "Don is cool" 20 GOTO 10