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copied!<p>While looking for a solution to the same problem, I first encountered this question here, but later I discovered a blog entry by <a href="http://nickeandersson.blogs.com/blog/2006/05/_modifying_the_.html" rel="nofollow noreferrer">Nicke Andersson</a>. which I found very helpful. Here is what I made of Nicke's example:</p> <pre><code>public class MonthCalendarEx : System.Windows.Forms.MonthCalendar { private int _offsetX; private int _offsetY; private int _dayBoxWidth; private int _dayBoxHeight; private bool _repaintSelectedDays = false; public MonthCalendarEx() : base() { OnSizeChanged(null, null); this.SizeChanged += OnSizeChanged; this.DateChanged += OnSelectionChanged; this.DateSelected += OnSelectionChanged; } protected static int WM_PAINT = 0x000F; protected override void WndProc(ref System.Windows.Forms.Message m) { base.WndProc(ref m); if (m.Msg == WM_PAINT) { Graphics graphics = Graphics.FromHwnd(this.Handle); PaintEventArgs pe = new PaintEventArgs( graphics, new Rectangle(0, 0, this.Width, this.Height)); OnPaint(pe); } } private void OnSelectionChanged(object sender, EventArgs e) { _repaintSelectedDays = true; } private void OnSizeChanged(object sender, EventArgs e) { _offsetX = 0; _offsetY = 0; // determine Y offset of days area while ( HitTest(Width / 2, _offsetY).HitArea != HitArea.PrevMonthDate && HitTest(Width / 2, _offsetY).HitArea != HitArea.Date) { _offsetY++; } // determine X offset of days area while (HitTest(_offsetX, Height / 2).HitArea != HitArea.Date) { _offsetX++; } // determine width of a single day box _dayBoxWidth = 0; DateTime dt1 = HitTest(Width / 2, _offsetY).Time; while (HitTest(Width / 2, _offsetY + _dayBoxHeight).Time == dt1) { _dayBoxHeight++; } // determine height of a single day box _dayBoxWidth = 0; DateTime dt2 = HitTest(_offsetX, Height / 2).Time; while (HitTest(_offsetX + _dayBoxWidth, Height / 2).Time == dt2) { _dayBoxWidth++; } } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); if (_repaintSelectedDays) { Graphics graphics = e.Graphics; SelectionRange calendarRange = GetDisplayRange(false); Rectangle currentDayFrame = new Rectangle( -1, -1, _dayBoxWidth, _dayBoxHeight); DateTime current = SelectionStart; while (current <= SelectionEnd) { Rectangle currentDayRectangle; using (Brush selectionBrush = new SolidBrush( Color.FromArgb( 255, System.Drawing.SystemColors.ActiveCaption))) { TimeSpan span = current.Subtract(calendarRange.Start); int row = span.Days / 7; int col = span.Days % 7; currentDayRectangle = new Rectangle( _offsetX + (col + (ShowWeekNumbers ? 1 : 0)) * _dayBoxWidth, _offsetY + row * _dayBoxHeight, _dayBoxWidth, _dayBoxHeight); graphics.FillRectangle(selectionBrush, currentDayRectangle); } TextRenderer.DrawText( graphics, current.Day.ToString(), Font, currentDayRectangle, System.Drawing.SystemColors.ActiveCaptionText, TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter); if (current == this.TodayDate) { currentDayFrame = currentDayRectangle; } current = current.AddDays(1); } if (currentDayFrame.X > 0) { graphics.DrawRectangle(new Pen( new SolidBrush(Color.Red)), currentDayFrame); } _repaintSelectedDays = false; } } } </code></pre>

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