How do I use unsafe native methods with UI permissions

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C#

UI

permissions

Hello,
I have simple dilemma about what is propper syntax and semanthics when using Unsafe Native Methods with UI Permissions. Here is example of program code with explenation at official MS Visual Studio Docs:

Article link

If I have understand correctly the syntax is this :

create NEW UI PERMISSION
call Unsafe Method


What I did not understand ,
Do I have to repeatedly create New UI Security Permission, each time I call Unsafe Method ?
If I have to call many different Unsafe Methods successively , do I have to create new UI Security Permission for each one of them.

What I have tried:

After reading a lot of unfamiliar stuf on the Internet about this subject I have created program that works properly, debbuger do not shows any errors or warnings, but I still do not know is it correctly written. Here is peace of code :

void Register_Clipboard_Listener_And_HotKeys()
{
    // Reset Registration message
    Registration_Message = string.Empty;

    // Demand new security permission
    new UIPermission(UIPermissionWindow.AllWindows, UIPermissionClipboard.AllClipboard).Demand();

    // Set Clipboard listener
    Clipboard_Listener = UnsafeNativeMethods.AddClipboardFormatListener(this.Handle);

    if (Clipboard_Listener == false)
    {
        Registration_Message += "   Clipboard listener could not be registered.  \n\n";
        Registration_Ok = false;
        return;
    }

    // Demand new security permission
    new UIPermission(UIPermissionWindow.AllWindows).Demand();

    // Hot Key Combination to Control + V
    Ctrl_V = UnsafeNativeMethods.RegisterHotKey(this.Handle, V, Control | MOD_NOREPEAT, V);
    if (Ctrl_V == false)
    {
        Registration_Message += "   Hot Key - Ctrl + V - could not be registered.  \n\n";
        Registration_Ok = false;
        return;
    }

    // Demand new security permission
    new UIPermission(UIPermissionWindow.AllWindows).Demand();

    // Hot Key Combination to Control + V
    Ctrl_Alt_V = UnsafeNativeMethods.RegisterHotKey(this.Handle, W, Control | Alt | MOD_NOREPEAT, V);
    if (Ctrl_Alt_V == false)
    {
        Registration_Message += "   Hot Key - Ctrl + Alt + V - could not be registered.  \n\n";
        Registration_Ok = false;
        return;
    }

Is this part of code correctly written.
Is there anything that is necessary to do before main window is closed.

Thanks in advance.

All the best,
Željko Perić