This seems like a echo frome my last post but whenever i try to compile my program called roundedrects i get the same case-sensitive eror: /home/user/mcs # mcs roundedrects.cs -pkg:mono-cairo -pkg:gtk-sharp-2.0
error CS2001: Source file `roundedrects.cs' could not be found
Compilation failed: 1 error(s), 0 warnings
/home/user/mcs #
But even when i verry carefully type the compile in frome the web page and frome what you provided i still get the same eror. is this case-sensitive eror a bug in the compiler or frome a nother cause?
here's my program:
using System;
using System.Reflection;
using System.Runtime.InteropServices;
using Cairo;
using Gtk;

public class GtkCairo
{
static void Main ()
{
Application.Init ();
Gtk.Window w = new Gtk.Window ("Mono-Cairo Rounded Rectangles");

DrawingArea a = new CairoGraphic ();

Box box = new HBox (true, 0);
box.Add (a);
w.Add (box);
w.Resize (500, 500);
w.DeleteEvent += close_window;
w.ShowAll ();

Application.Run ();
}

static void close_window (object obj, DeleteEventArgs args)
{
Application.Quit ();
}
}

public class CairoGraphic : DrawingArea
{
static double min (params double[] arr)
{
int minp = 0;
for (int i = 1; i < arr.Length; i++)
if (arr[i] < arr[minp])
minp = i;

return arr[minp];
}

static void DrawRoundedRectangle (Cairo.Context gr, double x, double y, double width, double height, double radius)
{
gr.Save ();

if ((radius > height / 2) || (radius > width / 2))
radius = min (height / 2, width / 2);

gr.MoveTo (x, y + radius);
gr.Arc (x + radius, y + radius, radius, Math.PI, -Math.PI / 2);
gr.LineTo (x + width - radius, y);
gr.Arc (x + width - radius, y + radius, radius, -Math.PI / 2, 0);
gr.LineTo (x + width, y + height - radius);
gr.Arc (x + width - radius, y + height - radius, radius, 0, Math.PI / 2);
gr.LineTo (x + radius, y + height);
gr.Arc (x + radius, y + height - radius, radius, Math.PI / 2, Math.PI);
gr.ClosePath ();
gr.Restore ();
}

static void DrawCurvedRectangle (Cairo.Context gr, double x, double y, double width, double height)
{
gr.Save ();
gr.MoveTo (x, y + height / 2);
gr.CurveTo (x, y, x, y, x + width / 2, y);
gr.CurveTo (x + width, y, x + width, y, x + width, y + height / 2);
gr.CurveTo (x + width, y + height, x + width, y + height, x + width / 2, y + height);
gr.CurveTo (x, y + height, x, y + height, x, y + height / 2);
gr.Restore ();
}

protected override bool OnExposeEvent (Gdk.EventExpose args)
{
using (Context g = Gdk.CairoHelper.Create (args.Window)){
DrawCurvedRectangle (g, 30, 30, 300, 200);
DrawRoundedRectangle (g, 70, 250, 300, 200, 40);
g.Color = new Color (0.1, 0.6, 1, 1);
g.FillPreserve ();
g.Color = new Color (0.2, 0.8, 1, 1);
g.LineWidth = 5;
g.Stroke ();
}
return true;
}
}

p.s. That advice you provided finaly made my hello.cs program compile and run successfuly!