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C# Switch off or cover duplicated monitor

I'm developing an app in C#. This app will run on a PC and also in a WACOM tablet, which is a duplicated monitor of the PC.
I want to switch off or cover the tablet with an image because the client can't see the beginning and the end of the process. When the time is right, the tablet will turn on or the screensaver will be removed so that the client can interact and, once the client's actions are finished, the WACOM tablet returns to the initial state. How can I do this?
I've been searching and I've found how to switch off the principal monitor but I don't know how to switch off only the tablet. Also some kind of screensaver would be right, but I didn't found how to put an image only in one screen.

You didn't mention the framework you are working, assuming you can reference WinForms, here is a way to show a form maximized on a specific screen:
System.Windows.Forms.Screen[] screens;
screens = System.Windows.Forms.Screen.AllScreens;
System.Windows.Forms.Screen selectedScreen = screens[1]; // choose your preffered monitor
// Sets the form to show maximized on the selected screen:
form.Left = currentScreen.Bounds.Width;
form.Top = currentScreen.Bounds.Height;
form.StartPosition = FormStartPosition.Manual;
form.Location = currentScreen.Bounds.Location;
Point p = new Point(currentScreen.Bounds.Location.X, currentScreen.Bounds.Location.Y);
form.Location = p;
form.WindowState = FormWindowState.Maximized;
form.Show();
If you disable form borders and have a PictureBox docked to "Fill" displaying your selected image you will achieve your intended goal and cover your tablet screen with an image.

Save Image in PictureBox with overlapping Controls

I am developing an application in which user can select an image in a picture box.
After that he can right click on the image and add a user control which will again display an Image along with some text. This user control can be added any number of times.
User can also re-position the user controls as per need.
All this functionality has been implemented and is working fine.
Now, the requirement is to save the Image along with the user control.
Above you can see the complete image which needs to be saved. Back image is the picture box image and the user control (small images with text).
When user will click on save button the image should get saved on his disk as a single image.
This is a windows application developed in C#.
I want to know that whether this functionality can be achieved or not. If yes, then please guide me in the right direction.

If you create a copy of the bitmap then with the Graphics.DrawImage() you can draw those images onto it. You need to calculate the position of those controls.
Look here for DrawImage: http://msdn.microsoft.com/en-us/library/42807xh1.aspx
example:
Bitmap copy = new Bitmap(OriginalBitmap);
Graphics g = Graphics.FromImage(copy);
g.DrawImage(arrowBitmap, new Point(..));
copy.Save(...);

A very simple and straight forward solution exists, has been thought of by Microsoft and includes these steps:
Instead of PictureBox use a Panel and instead of using the Image property of the PictureBox use the BackgroundImage property of the Panel
note: By using also the BackgroundImageLayout property you can quite easily instruct the Panel to stretch, center or zoom the image (I'm presuming the default value which is tile is not a good option in your case)
Instead of placing the other user controls at higher Z order but alongside the previous PictureBox place them inside the Panel
Use the Control.DrawToBitmap method like so:
private void button1_Click(object sender, EventArgs e) {
var bmp = new Bitmap(this.panel1.Width, this.panel1.Height);
this.panel1.DrawToBitmap(bmp, new Rectangle(Point.Empty, bmp.Size));
bmp.Save(#"D:\test.png", ImageFormat.Png);
}
That will result in your controls begin rendered along with the picture:
Furthermore, and if your scenario allows it, you could simply use the DrawToBitmap method with any control which contains all of the actors you wish to render, for instance the actual Form.

DrawToBitmap on windows xp

I have a user control that shows plate number of a vehicle(it contains a background image and some TextBoxes), I use DrawToBitmap() Method to get a bitmap of this control and show the bitmap on my form, It works fine on Windows 7 but in Windows XP service pack 3 only background image is drawn and texts in textboxes are not drawn, what should I do?
var clt = new ControlLisenceTouch();Bitmap b = new Bitmap(clt.Width, clt.Height);
clt.License = License.FromCar(someCar);
clt.Invalidate(true);
clt.DrawToBitmap(b, Rectangle.FromLTRB(0, 0, clt.Width, clt.Height));
pictureBox1.Image = b;

This guy had the same sort of problem, and while the answer is not perfect, it did do it for him. The biggest problem here was that if another window was covering your control, that window would be shown as well. Look at my answer, the third edit shows taking a screen shot, and cropping a control out of it.
How can I get a screenshot of control? DrawToBitmap not working
According to http://msdn.microsoft.com/en-us/library/system.windows.forms.control.drawtobitmap.aspx
Windows XP sp3 is fully supported

Getting a text area in the system tray

i was just wondering what i need to research to be able to have a programme that is in the system tray, when the user clicks the programme icon, just above the system tray a small text area appears allowing the user to type in a search condition. There is plenty of resources for c# and getting your programme in the system tray, but then it just opens as normal, which is not quite what i am looking for.
Thanks

One way to accomplish this is to use a standard WinForms window which contains a single text box and has no border. This window can then be displayed and positioned as normal (likely using many of the existing samples) but will appear as a floating text box.
var form = new MyTextBoxForm();
form.FormBorderStyle = BorderStyle.None;
form.StartPosition = FormStartPosition.Manual;
// position the form
form.ShowDialog();

Handle the NotifyIcon.Click event and show your form in the desired location.
For example:
var screen = Screen.PrimaryScreen;
form.Left = screen.WorkingArea.Right - form.Width;
form.Top = screen.WorkingArea.Bottom - form.Height;

Maybe with this Make your program in the system + add a menu you could try editing the menu, like you'd do a regular menu with toolstrips.... and change the label by a textbox.
Just a random idea.

Showing image / text on screen without forms in c#

How can I show something on screen wihtout using forms?
Actually, I want to show some text and images popping on screen.

EDIT: just like i said HERE
What you can do is to create a alphatransparent form that draws the PNG and position it at the correct location and bind move etc.
http://www.codeproject.com/KB/GDI-plus/perpxalpha_sharp.aspx
PerPixelAlphaForm transparentImageForm = new PerPixelAlphaForm();
transparentImageForm.SetBitmap(<IMAGE GOES HERE>,<OPACITY GOES HERE>);
//opacity is the opacity that the image will be drawn with, a value of 255 = all transparent parts will be alpha/transparent just as much as the original PNG etc..
and you can put a timer that calls SetBitmap and changes the Opacity to fade in/out the image on the screen
And you can generate the text (on the fly) in a nice way with code from THIS article
and pass that image to the SetBitmap of the AlphaTransparent form.
EDIT: OR GO TO WPF.

I don't think you can: a form is equivalent to a window, and Windows applications draw into a window and not directly onto the screen (unless perhaps it's the backgroun/wallpaper, which I don't know about).

I think that's overdoing it but XNA will allow you to draw to the screen, but it is meant to be used for games so you will have trouble fitting it to a normal application.