c# - How can i add optional directory for bmp.screenshotsave -

i need please. want implement ability choose folder before saving screenshots. working code have created:

bmpscreenshot.save("c:\\test\\pictures\\scr_(" + pict_no + ").jpeg", imageformat.jpeg);  pict_no++; 

it autoscreenshoter increments number of screenshot. folder constant. want create selection of folder before capturing auto screenshot. used this:

public partial class form1 : form {     public form1()     {         initializecomponent();      }      public void tick(object stateinfo)     {         string s;         s = textbox3.text+ "\\scr_(" + pict_no + ").jpeg";          // set bitmap object size of screen          bmpscreenshot = new bitmap(screen.primaryscreen.bounds.width, screen.primaryscreen.bounds.height, pixelformat.format32bppargb);          // create graphics object bitmap          gfxscreenshot = graphics.fromimage(bmpscreenshot);          // take screenshot upper left corner right bottom corner          gfxscreenshot.copyfromscreen(screen.primaryscreen.bounds.x, screen.primaryscreen.bounds.y, 0, 0, screen.primaryscreen.bounds.size, copypixeloperation.sourcecopy);          // save screenshot specified path user has chosen          bmpscreenshot.save(s, imageformat.jpeg);          pict_no++;       }      private void button1_click(object sender, eventargs e)     {             messagebox.show("printscreenování právě začalo bude probíhat po " +textbox1.text+ " sekundách.\npřeji příjemný den :d");          cas();     }      private void textbox1_textchanged(object sender, eventargs e)     {         int aninteger;         aninteger = convert.toint32(textbox1.text);         aninteger = int.parse(textbox1.text);      }      public void cas()     {         int aninteger;         aninteger = convert.toint32(textbox1.text);         aninteger = int.parse(textbox1.text);         timercallback callback = new timercallback(tick);         // create timer tick         system.threading.timer statetimer = new system.threading.timer(callback, null, 0, aninteger*1000);         // loop here forever         (; ; )         {             int eninteger;             eninteger = convert.toint32(textbox2.text);             eninteger = int.parse(textbox2.text);             if (pict_no == eninteger) environment.failfast("konec programu.");         }     }      public void choosefolder()     {         if (folderbrowserdialog1.showdialog() == dialogresult.ok)         {             textbox3.text = folderbrowserdialog1.selectedpath;         }     }      public static bitmap bmpscreenshot { get; set; }      public static graphics gfxscreenshot { get; set; }      public static int pict_no { get; set; }      private void textbox2_textchanged(object sender, eventargs e)     {      }      private void textbox3_textchanged(object sender, eventargs e)     {      }      private void button2_click(object sender, eventargs e)     {         choosefolder();      }  } 

i don't know why doesn't work.

you can invoke methods in main thread can access gui tick event.

in tick event:

this.invoke(new methodinvoker(delegate { this.proceed(); }), null); 

then can put want in proceed() method.

private void proceed() {     string s;     s = textbox3.text+ "\\scr_(" + pict_no + ").jpeg";      // set bitmap object size of screen      bmpscreenshot = new bitmap(screen.primaryscreen.bounds.width, screen.primaryscreen.bounds.height, pixelformat.format32bppargb);      // create graphics object bitmap      gfxscreenshot = graphics.fromimage(bmpscreenshot);      // take screenshot upper left corner right bottom corner      gfxscreenshot.copyfromscreen(screen.primaryscreen.bounds.x, screen.primaryscreen.bounds.y, 0, 0, screen.primaryscreen.bounds.size, copypixeloperation.sourcecopy);      // save screenshot specified path user has chosen      bmpscreenshot.save(s, imageformat.jpeg);      pict_no++; }