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copied!<p>The problem with the fill solution that is marked as the answer is it does not work well with non solid/uniform brushes. Here is another one based on the GraphicsPath class wich I think is more reusable:</p> <pre><code>public static void FillRoundedRectangle(Graphics graphics, Rectangle rectangle, Brush brush, int radius) { if (graphics == null) throw new ArgumentNullException("graphics"); SmoothingMode mode = graphics.SmoothingMode; graphics.SmoothingMode = SmoothingMode.AntiAlias; using (GraphicsPath path = RoundedRectangle(rectangle, radius)) { graphics.FillPath(brush, path); } graphics.SmoothingMode = mode; } public static GraphicsPath RoundedRectangle(Rectangle r, int radius) { GraphicsPath path = new GraphicsPath(); int d = radius * 2; path.AddLine(r.Left + d, r.Top, r.Right - d, r.Top); path.AddArc(Rectangle.FromLTRB(r.Right - d, r.Top, r.Right, r.Top + d), -90, 90); path.AddLine(r.Right, r.Top + d, r.Right, r.Bottom - d); path.AddArc(Rectangle.FromLTRB(r.Right - d, r.Bottom - d, r.Right, r.Bottom), 0, 90); path.AddLine(r.Right - d, r.Bottom, r.Left + d, r.Bottom); path.AddArc(Rectangle.FromLTRB(r.Left, r.Bottom - d, r.Left + d, r.Bottom), 90, 90); path.AddLine(r.Left, r.Bottom - d, r.Left, r.Top + d); path.AddArc(Rectangle.FromLTRB(r.Left, r.Top, r.Left + d, r.Top + d), 180, 90); path.CloseFigure(); return path; } </code></pre> <p>and here is the code for Draw only (not fill), based on the same idea:</p> <pre><code>public static void DrawRoundedRectangle(Graphics graphics, Rectangle rectangle, Pen pen, int radius) { if (graphics == null) throw new ArgumentNullException("graphics"); SmoothingMode mode = graphics.SmoothingMode; graphics.SmoothingMode = SmoothingMode.AntiAlias; using (GraphicsPath path = RoundedRectangle(rectangle, radius)) { graphics.DrawPath(pen, path); } graphics.SmoothingMode = mode; } </code></pre>

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