C # intercepts partial screen

Capture full-screen image private void Btnfullscreen_click (object sender, EventArgs e) {//Create image to save future intercepted images            Bitmap image = New Bitmap (Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);            Graphics imggraphics = graphics.fromimage (image); Setting the screenshot area imggraphics.copyfromscreen (0, 0, 0, 0, New Size (Screen.PrimaryScreen.Bounds.Width, Screen.primaryscree            N.bounds.height));        Save SaveImage (image); }//Save image file private void SaveImage (image image) {if (Savefiledialog.showdialog (this) = = Dialogresu Lt.                OK) {string fileName = Savefiledialog.filename;                string extension = Path.getextension (fileName); if (Extension = = ". jpg") {image.                Save (FileName, imageformat.jpeg); } else {image.                Save (FileName, imageformat.bmp);     }       }        } 

C # intercepts screen parts