Alsing.Windows.Forms.SyntaxBox.EditViewControl.OnChange C# (CSharp) Method

        public void OnChange()
        {
            if (Caret.Position.Y > Document.Count - 1)
            {
                Caret.Position.Y = Document.Count - 1;
                //this.Caret.MoveAbsoluteHome (false);
                ScrollIntoView();
            }

            try
            {
                if (VirtualWhitespace == false && Caret.CurrentRow != null &&
                    Caret.Position.X > Caret.CurrentRow.Text.Length)
                {
                    Caret.Position.X = Caret.CurrentRow.Text.Length;
                    Redraw();
                }
            }
            catch {}


            if (!ContainsFocus)
            {
                Selection.ClearSelection();
            }


            if (Selection.LogicalBounds.FirstRow > Document.Count)
            {
                Selection.Bounds.FirstColumn = Caret.Position.X;
                Selection.Bounds.LastColumn = Caret.Position.X;
                Selection.Bounds.FirstRow = Caret.Position.Y;
                Selection.Bounds.LastRow = Caret.Position.Y;
            }

            if (Selection.LogicalBounds.LastRow > Document.Count)
            {
                Selection.Bounds.FirstColumn = Caret.Position.X;
                Selection.Bounds.LastColumn = Caret.Position.X;
                Selection.Bounds.FirstRow = Caret.Position.Y;
                Selection.Bounds.LastRow = Caret.Position.Y;
            }

            Redraw();
        }