try
            {
                Image image = new Bitmap(width, height);
                Graphics g = Graphics.FromImage(image);

                g.CopyFromScreen(x, y, 0, 0, new System.Drawing.Size(width, height));     


                string hour = DateTime.Now.Minute.ToString();
                string second = DateTime.Now.Second.ToString();
                image.Save(ScreenshotPath + "\\" + hour + "_" + second + ".jpg");
            }
            catch 
            { 

            }



ScreenshotPath------------保存路径

 string hour = DateTime.Now.Minute.ToString();
string second = DateTime.Now.Second.ToString();------------------------取当前时间，作为文文件名