c# - Generic error occurred in GDI+ while setting wallpaper twice -

i have code should set wallpaper

byte[] data = webclient.downloaddata("http://imageurl"); image yourimage = null; using (memorystream mem = new memorystream(data)) {     yourimage = null;     yourimage = image.fromstream(mem);     yourimage.save("image.jpg", imageformat.jpeg);     wallpaper.set(new uri("image.jpg", urikind.relative), wallpaper.style.stretched);     yourimage.dispose(); } 

whenever run twice, stops @ yourimage.save("image.jpg", imageformat.jpeg); saying was

system.runtime.interopservices.externalexception unhandled   hresult=-2147467259   message=allgemeiner fehler in gdi+.   source=system.drawing   errorcode=-2147467259   stacktrace:        bei system.drawing.image.save(string filename, imagecodecinfo encoder, encoderparameters encoderparams)        bei system.drawing.image.save(string filename, imageformat format)        bei streetviewhintergrundbild.form1.button1_click(object sender, eventargs e) in d:\form1.cs:zeile 70.        bei system.windows.forms.control.onclick(eventargs e)        bei system.windows.forms.button.onclick(eventargs e)        bei system.windows.forms.button.onmouseup(mouseeventargs mevent)        bei system.windows.forms.control.wmmouseup(message& m, mousebuttons button, int32 clicks)        bei system.windows.forms.control.wndproc(message& m)        bei system.windows.forms.buttonbase.wndproc(message& m)        bei system.windows.forms.button.wndproc(message& m)        bei system.windows.forms.control.controlnativewindow.onmessage(message& m)        bei system.windows.forms.control.controlnativewindow.wndproc(message& m)        bei system.windows.forms.nativewindow.debuggablecallback(intptr hwnd, int32 msg, intptr wparam, intptr lparam)        bei system.windows.forms.unsafenativemethods.dispatchmessagew(msg& msg)        bei system.windows.forms.application.componentmanager.system.windows.forms.unsafenativemethods.imsocomponentmanager.fpushmessageloop(intptr dwcomponentid, int32 reason, int32 pvloopdata)        bei system.windows.forms.application.threadcontext.runmessageloopinner(int32 reason, applicationcontext context)        bei system.windows.forms.application.threadcontext.runmessageloop(int32 reason, applicationcontext context)        bei system.windows.forms.application.run(form mainform)        bei streetviewhintergrundbild.program.main() in d:\program.cs:zeile 19.        bei system.appdomain._nexecuteassembly(runtimeassembly assembly, string[] args)        bei system.appdomain.executeassembly(string assemblyfile, evidence assemblysecurity, string[] args)        bei microsoft.visualstudio.hostingprocess.hostproc.runusersassembly()        bei system.threading.threadhelper.threadstart_context(object state)        bei system.threading.executioncontext.runinternal(executioncontext executioncontext, contextcallback callback, object state, boolean preservesyncctx)        bei system.threading.executioncontext.run(executioncontext executioncontext, contextcallback callback, object state, boolean preservesyncctx)        bei system.threading.executioncontext.run(executioncontext executioncontext, contextcallback callback, object state)        bei system.threading.threadhelper.threadstart()   innerexception:  

wallpaper.cs:

using microsoft.win32; using system; using system.collections.generic; using system.io; using system.linq; using system.runtime.interopservices; using system.text; using system.threading.tasks;  namespace ns {     public sealed class wallpaper     {         wallpaper() { }          const int spi_setdeskwallpaper = 20;         const int spif_updateinifile = 0x01;         const int spif_sendwininichange = 0x02;          [dllimport("user32.dll", charset = charset.auto)]         static extern int systemparametersinfo(int uaction, int uparam, string lpvparam, int fuwinini);          public enum style : int         {             tiled,             centered,             stretched         }          public static void set(uri uri, style style)         {             system.io.stream s = new system.net.webclient().openread(uri.tostring());              system.drawing.image img = system.drawing.image.fromstream(s);             string temppath = path.combine(path.gettemppath(), "wallpaper.bmp");             img.save(temppath, system.drawing.imaging.imageformat.bmp);              registrykey key = registry.currentuser.opensubkey(@"control panel\desktop", true);             if (style == style.stretched)             {                 key.setvalue(@"wallpaperstyle", 2.tostring());                 key.setvalue(@"tilewallpaper", 0.tostring());             }              if (style == style.centered)             {                 key.setvalue(@"wallpaperstyle", 1.tostring());                 key.setvalue(@"tilewallpaper", 0.tostring());             }              if (style == style.tiled)             {                 key.setvalue(@"wallpaperstyle", 1.tostring());                 key.setvalue(@"tilewallpaper", 1.tostring());             }              systemparametersinfo(spi_setdeskwallpaper,                 0,                 temppath,                 spif_updateinifile | spif_sendwininichange);         }     } }