How can i release/dispose directx graphics device when doing alt+del to move to a full screen game?

I don't want to do anything with or in the game. The problem is when i'm using the directx in my program since the graphics device is in use when i switch to the game full screen that need to use directx too my program is crash in fact visual studio 2012 pro is shut down.

I need somehow to release/dispose in my program the device when switching to the game(in this case it's a game) and then when switching back to windows to restart/init my device again.

This is the code where i init my directx :

public Boolean InitializeDirectX(PictureBox pb)
        {
            DispMode = Manager.Adapters[Manager.Adapters.Default.Adapter].CurrentDisplayMode;
            D3Dpp = new PresentParameters();
            D3Dpp.BackBufferFormat = DispMode.Format;
            D3Dpp.PresentFlag = PresentFlag.LockableBackBuffer;

            D3Dpp.SwapEffect = SwapEffect.Discard;
            D3Dpp.PresentationInterval = PresentInterval.One; //wait for vertical sync. Synchronizes the painting with
            //monitor refresh rate for smoooth animation
            D3Dpp.Windowed = true; //the application has borders

            try
            {
                D3Ddev = new Device(Manager.Adapters.Default.Adapter, DeviceType.Hardware, pb.Handle,
                                                                           CreateFlags.SoftwareVertexProcessing, D3Dpp);
                D3Ddev.VertexFormat = CustomVertex.PositionColored.Format;
                D3Ddev.RenderState.Lighting = false;
                D3Ddev.RenderState.CullMode = Cull.CounterClockwise;

                //load imagesBmp to panelTexture
                //panelTexture = Texture.FromBitmap(D3Ddev, imagesBmp, Usage.Dynamic, Pool.Default)

                backTexture = TextureLoader.FromStream(D3Ddev, mymem);
                scannedCloudsTexture = new Texture(D3Ddev, 512, 512, 1, Usage.Dynamic, Format.A8R8G8B8, Pool.Default);

                //sprite is used to draw the texture
                D3Dsprite = new Sprite(D3Ddev);

                return true;
            }
            catch
            {
                return false;
            }
        }

And this is where i'm getting the exception when switching to the game full screen:

Bitmap bmpn;
        float angle = 0;
        private void DisplayOnScreen(float angleF)
        {
            try
            {
                if (angle < 360)
                {
                    bmpn = new Bitmap(512, 512);
                    angle++;
                }
                else
                {
                    angle = 361;
                }
                Surface backbuffer;
                Brush myBrush = new SolidBrush(Color.FromArgb(110, 0, 255, 0)); //semi transparent color to draw the rotating cone 
                Graphics g;

                //clear the backbuffer with Color.FromArgb(56, 56, 56). This is the double buffer mechanism. Drawing to offscreen 
                //backbuffer and in the end flipping it to main one which is our panelContainer 
                D3Ddev.Clear(ClearFlags.Target, Color.FromArgb(56, 56, 56), 1, 0);
                D3Ddev.BeginScene();

                //Draw Sprites 
                ////////////////////////////////////////////////////// 
                D3Dsprite.Begin(SpriteFlags.AlphaBlend);

                // bitmap with clouds 
                D3Dsprite.Draw2D(backTexture, new PointF(0, 0), 0F, new PointF(0F, 0F), Color.White);
                //the part of clouds that are inside the cone 
                D3Dsprite.Draw2D(scannedCloudsTexture, new PointF(0F, 0F), 0F, new PointF(0F, 0F), Color.White);
                //rotate cone 
                //D3Dsprite.Draw2D(scannerTexture, new PointF(104.5F, 0F), angle, new PointF(256F, 255F), Color.White); 

                D3Dsprite.Flush();
                D3Dsprite.End();
                ////////////////////////////////////////////////////// 


                //Draw the cone. 
                using (backbuffer = D3Ddev.GetBackBuffer(0, 0, BackBufferType.Mono))
                {
                    using (g = backbuffer.GetGraphics())
                    {
                        g.SmoothingMode = SmoothingMode.AntiAlias;
                        /*if (angle < 360)
                        {
                            g = Graphics.FromImage(bmpn);
                        }*/
                        g.FillPie(myBrush, 256F - distanceFromCenterPixels, 255F - distanceFromCenterPixels,
                        distanceFromCenterPixels * 2F, distanceFromCenterPixels * 2F, angleF - 23F, 46F);
                        if (angle <= 360)
                        {
                            this.Invalidate();
                            /*pictureBox1.Image.Save(@"c:\coneimages\" + "PictureBox_Images" + angle + ".gif",ImageFormat.Gif);
                            bmpn.Save(@"c:\coneimages\" + "Cone_Images" + angle + ".gif");
                            bmpn.Dispose();*/
                            //Rectangle rect = new Rectangle(0,0,512,512);
                            //this.DrawToBitmap(bmpn, rect);
                            //g.DrawImage(bmpn, rect);
                            //bmpn.Save(@"c:\coneimages\" + "Cone_Images" + angle + ".gif");
                            //bmpn.Dispose();
                        }

                    }
                }

                D3Ddev.EndScene();
                D3Ddev.Present(); //performs the flipping
            }

The exception is on the line:

D3Ddev.Present();

And this is the exception message:

Microsoft.DirectX.Direct3D.DeviceLostException occurred
  HResult=-2005530520
  Message=Error in the application.
  Source=Microsoft.DirectX.Direct3D
  ErrorCode=-2005530520
  ErrorString=D3DERR_DEVICELOST
  StackTrace:
       at Microsoft.DirectX.Direct3D.Device.PresentInternal(tagRECT* sourceRectangle, tagRECT* destRectangle, IntPtr overrideWindow)
       at Microsoft.DirectX.Direct3D.Device.PresentInternal(tagRECT* sourceRectangle, tagRECT* destRectangle, Control overrideWindow)
       at Microsoft.DirectX.Direct3D.Device.Present()
       at mws.ScanningClouds.DisplayOnScreen(Single angleF) in d:\C-Sharp\Download File\Downloading-File-Project-Version-012\Downloading File\ScanningClouds.cs:line 347
  InnerException:

Line 347 is:

D3Ddev.Present();

I tried to google but didn't find how to do it only found that i need somehow to release/dispose i think the device when switching to the full screen and then when switching back maybe i need to re InitializeDirectX again. Not sure if this is the problem but the exception happen only when i switch to the full screen game that also using the directx.