How to take screenshot using C# for multiple screen games of high defination

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C#

game

screen

screenshot

I want to take screenshot using C# for multiple screen games of high definition.It works normally very good but if I am going to take the screenshot of full screen graphics games it shows a black rectangle box.I have googled a lot but did't got any proper solution.So could any one give a solution for that its very urgent for me.More over I have not work with directX .More over my project is in .Net framework 4.5.
Please help me with a proper code example.That is workable regarding this..please guys.

What I have tried:

I have used C# for that.My code is:

 string ScreenPath,directory;
code to initialize:
  string appPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "anticheat");
            try
            {
                if (!Directory.Exists(appPath))
                {
                    Directory.CreateDirectory(appPath);
                }
            }
            catch(Exception)
            {
            }
            directory = appPath;
-------------------------------------------
code to capture image
   public void screenCapture(bool showCursor)
        {
            int noofscreens = 0;         
            Screen[] screens;

            screens = Screen.AllScreens;
            noofscreens = screens.Length;

            Point curPos = new Point(Cursor.Position.X, Cursor.Position.Y);
            Size curSize = new Size();
            curSize.Height = Cursor.Current.Size.Height;
            curSize.Width = Cursor.Current.Size.Width;

            //ScreenPath = "C:\\Users\\user\\Desktop\\sssss.bmp";
            string foldername = LoginFrm.username;
            ScreenPath = directory +"/"+foldername.Replace('@', '_')+"-"+ DateTime.Now.ToString("dd-MMM-yyy hh-mm-ss tt") + ".jpg";
            

            if (!ScreenShot.saveToClipboard)
            {

          
            }

            if (ScreenPath != "" || ScreenShot.saveToClipboard)
            {

                //Conceal this form while the screen capture takes place
                //this.WindowState = System.Windows.Forms.FormWindowState.Minimized;
                //this.TopMost = false;

                //Allow 250 milliseconds for the screen to repaint itself (we don't want to include this form in the capture)
                System.Threading.Thread.Sleep(250);

                Rectangle bounds = Screen.GetBounds(Screen.GetBounds(Point.Empty));
                string fi = "";
                if (ScreenPath != "")
                {
                    fi = new FileInfo(ScreenPath).Extension;
                }

                //===============================================================================
                //this.Visible = false;
                //this.Refresh();
                System.Threading.Thread.Sleep(100);
            
              
             
                int i = 0;

                foreach (var screen in System.Windows.Forms.Screen.AllScreens)
                {
                    ScreenPath = directory + "/" + foldername.Replace('@', '_') + "-" + DateTime.Now.ToString("dd-MMM-yyy hh-mm-ss tt") + "_Sc(" + (i +1)+ ")" + ".jpg";

                    Rectangle bounds1 = screen.Bounds;// screen.GetBounds(Screen.GetBounds(Point.Empty));
                    //Point source = new Point(bounds1.X, bounds1.Y);
                    //Point destination = new Point(bounds1.X + bounds1.Width, bounds1.Y);

                    ScreenShot.CaptureImage(showCursor, curSize, curPos, Point.Empty, Point.Empty, bounds1, ScreenPath, fi);
                    //grabwindow[i] = new Form1(this, "Click to capture screen " + (i + 1).ToString(), screen.Bounds.X, screen.Bounds.Y, screen.Bounds.Width, screen.Bounds.Height, i);
                    //grabwindow[i].Show();
                    i++;
                }
                //===============================================================================








                //ScreenShot.CaptureImage(showCursor, curSize, curPos, Point.Empty, Point.Empty, bounds, ScreenPath, fi);

                //The screen has been captured and saved to a file so bring this form back into the foreground
                //this.WindowState = System.Windows.Forms.FormWindowState.Normal;
                //this.TopMost = true;

                if (ScreenShot.saveToClipboard)
                {
                   
                   // MessageBox.Show("Screen saved to clipboard", "TeboScreen", MessageBoxButtons.OK);

                }
                else
                {

                  //  MessageBox.Show("Screen saved to file", "TeboScreen", MessageBoxButtons.OK);

                }


            }


        }

  
---------------------------------------
class ScreenShot
    {

        public static bool saveToClipboard = false;


        public static void CaptureImage(bool showCursor, Size curSize, Point curPos, Point SourcePoint, Point DestinationPoint, Rectangle SelectionRectangle, string FilePath, string extension)
        {

            DataLayer dl = new DataLayer();
            string ftp = "my Serverpath";

            if(LoginFrm.username!="")
            {
                folder = folder + LoginFrm.username + "/";
            }
            SourcePoint = new Point(SelectionRectangle.X, SelectionRectangle.Y);
            using (Bitmap bitmap = new Bitmap(SelectionRectangle.Width, SelectionRectangle.Height))
            {

                using (Graphics g = Graphics.FromImage(bitmap))
                {
                   
                    g.CopyFromScreen(SourcePoint, DestinationPoint, SelectionRectangle.Size);

                    if (showCursor)
                    {
                        Rectangle cursorBounds = new Rectangle(curPos, curSize);
                        Cursors.Default.Draw(g, cursorBounds);

                    }

                }

                if (saveToClipboard)
                {
                    Image img = (Image)bitmap;
                    Clipboard.SetImage(img);
                }
                else
                {

                    switch (extension)
                    {
                        case ".bmp":
                            bitmap.Save(FilePath, ImageFormat.Bmp);
                            //dl.UploadFile(ftp, folder, username, psw, FilePath);                           
                            break;
                        case ".jpg":
                            bitmap.Save(FilePath, ImageFormat.Jpeg);
                            string fname = Path.GetFileName(FilePath);
                            //dl.UploadFile(ftp, folder, username, psw, FilePath);
                            break;
                        case ".gif":
                            bitmap.Save(FilePath, ImageFormat.Gif);
                            dl.UploadFile(ftp, folder, username, psw, FilePath);
                            break;
                        case ".tiff":
                            bitmap.Save(FilePath, ImageFormat.Tiff);
                            dl.UploadFile(ftp, folder, username, psw, FilePath);
                            break;
                        case ".png":
                            bitmap.Save(FilePath, ImageFormat.Png);
                            dl.UploadFile(ftp, folder, username, psw, FilePath);
                            break;
                        default:
                            bitmap.Save(FilePath, ImageFormat.Jpeg);
                            dl.UploadFile(ftp, folder, username, psw, FilePath);
                            break;
                    }

                }

            }

        }
    }