C# Bitmap/Graphics Out of Memory -

i'm trying take snapshot of whole screen reading pixel values. i'm doing without problem. after 214 snapshots, i'm getting out of memory exception.

bitmap screenshot = new bitmap(screen.primaryscreen.bounds.width,   screen.primaryscreen.bounds.height);  public bitmap takesnapshot() {     graphics graphic = null;     rectangle rect = new rectangle(0, 0, screen.primaryscreen.bounds.width,       screen.primaryscreen.bounds.height);      using (graphic = graphics.fromimage(screenshot))     {         graphic.copyfromscreen(screen.primaryscreen.bounds.x, screen.primaryscreen.bounds.y,              0, 0,              screenshot.size,              copypixeloperation.sourcecopy);     }      return screenshot.clone(rect,system.drawing.imaging.pixelformat.format32bppargb); } 

i'm using method timer

bitmap bmp = takesnapshot();         var c = bmp.getpixel(0,0); 

it giving invalid parameter exception. solved "using". i'm stuck on exception.

you need dispose disposable resources once you're done working them. bitmap class implements idisposable - disposable resource. correct pattern instead of

bitmap bmp = takesnapshot(); var c = bmp.getpixel(0,0); 

something like

bitmap bmp = null; try {   bmp = takesnapshot();   var c = bmp.getpixel(0,0);   // more work bmp } {   if (bmp != null)   {     bmp.dipose();       } } 

or in short form (which preferable):

using(bitmap bmp = takesnapshot()) {   var c = bmp.getpixel(0,0);   // more work bmp } 

reference: using objects implement idisposable

edit

you can emulate issue:

public class testdispose : idisposable {     private intptr m_chunk;     private int m_counter;     private static int s_counter;      public testdispose()     {         m_counter = s_counter++;         // 256 mb         m_chunk = marshal.allochglobal(1024 * 1024 * 256);         debug.writeline("testdispose {0} constructor called.", m_counter);     }      public void dispose()     {         debug.writeline("testdispose {0} dispose called.", m_counter);         marshal.freehglobal(m_chunk);         m_chunk = intptr.zero;     } }  class program {     static void main(string[] args)     {         for(var = 0; < 1000; ++)         {             var foo = new testdispose();         }         console.writeline("press key end...");         console.in.readline();     } }