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C# Disable mouse takeover

I am currently using the windows on screen keyboard to control the program for the cnc machine. In C# I tried to make a simple on screen keyboard with only the keys I need. I use this command to send key
SendKeys.SendWait("{ENTER}");
or
SendKeys.Send("{ENTER}");
The first click works, but then the background program "takes away" the mouse after the click and then I can no longer control it. While such a problem does not occur on the windows on screen keyboard
Is there a way to avoid this, to make it work like microsoft osk?
Thanks

Disabling mouse in C#

I want to disable a pc mouse from a C# code. I don't want to just disable moving or clicking. I want to disconnect the mouse from power. With monitor there is a solution via SendMessage win32 method. I haven't found suchlike solution for a mouse.
Is there any solution for this?

How can I capture a key press, outside of the form?

I have been trying to capture the keys pressed outside of my winform, but obviously a KeyPress event won't work.
I haven't been able to get any closer than the KeyPress event, which only works on the form level, as specified
I suspect that I will have to do the
[DllImportAttribute("user32.dll")]
, but I have little to no experience with that.

Being able to capture key presses anywhere requires using Hooks.
There is a library on CodePlex which simplifies implementing Application and Global Mouse and Keyboard Hooks for C# users.

how to call onmousedown method on windows using c#

i need to perform the action done by using left mouse click when i press W for example:
i want to move the cruse to a folder and then press w so the folder open
i want to move the cruse to a file and press w and drag it and drop when i release w
i tried to use windowsFrom and performing the onKeyPress() and it calls onMouseDown() but of course it means that the onMouseDown() function will be called inside the form and what i need is a system behavior,,,, i am using windows 7 64 on VS2010 but i would like if it is some thing global for all windows
thanks a lot for helping,,,

The first step you'll need to capture Key Down events in an external application is define a global hotkey:
I recommend checking out some of the answers for this question for a global hot-key: Best way to tackle global hotkey processing in c#? or this CodeProject article: A Simple C# Global Low Level Keyboard Hook
Then, as M. Babcock said you'll need to send the mouse-down events. The link he provided in the comment is a good one. I'm repeating it here for completeness.
How to simulate Mouse Click in C#?
If you actually need to send keyboard inputs, you can use InputSimulator which is something I have advocated (and used in the past) and it provides a very flexible (and reliable) wrapper that is capable of simulating keyboard events.
It wraps SendInput under the hood but abstracts away all the PInvoke calls and other complexity.
InputSimulator.SimulateKeyDown(VirtualKeyCode.CTRL);
InputSimulator.SimulateKeyPress(VirtualKeyCode.KEYS_V);
InputSimulator.SimulateKeyUp(VirtualKeyCode.CTRL);
or
InputSimulator.SimulateModifiedKeyStroke(VirtualKeyCode.CONTROL, VirtualKeyCode.VK_C);

Use a boolean flag for the clicking, and set it on both by clicking or pressing your hotkey. For instance, this flag should be declared inside the form, and the events KeyDown and MouseDown set it true, while KeyUp and MouseUp set it false. For all your actions now you use this flag for verifying the click. (Not sure if it would works in Windows app, in XNA it works fine). For using outside the class, just set this flag as a public property.

Disable Mouse moves and clicks using c# windows application

I want to Enable the Mouse moves and clicks Using c# windows application.
How to do this ?
I don't want to unplug my mouse from my PC. :)

You can use this library to make a mouse hook that can suppress the mouse input.
You can then check GetForegroundWindow() and set e.Handled to true.

Find the GUID of mouse and disable the mouse using c#