Detect status of Caps Lock in c #

As of version 2.0 of the .Net Framework, to detect the status of Block Lock, Number Lock and Scroll Lock, you can use Control.IsKeyLocked (Windows Forms):

Control.IsKeyLocked(Keys.CapsLock);
Control.IsKeyLocked(Keys.NumLock);
Control.IsKeyLocked(Keys.Scroll);

Another option is to use the Windows API, importing the function GetKeyState :

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]
public static extern short GetKeyState(int keyCode);

And you can use it in the following way:

bool BloqDesp = (((ushort)GetKeyState(0x91)) & 0xffff) != 0;     
bool BloqMay = (((ushort)GetKeyState(0x14)) & 0xffff) != 0;
bool BloqNum = (((ushort)GetKeyState(0x90)) & 0xffff) != 0;

If you are working on Windows.Forms, you can use:

Control.IsKeyLocked (Keys.CapsLock);

You have several options.

The .Net Framework option:

Control.IsKeyLocked(Keys.CapsLock);

Or the option for calls to the Windows API:

//Defines la llamada a la función
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]
public static extern short GetKeyState(int keyCode);

//Y luego llamas a la función con el code de la tecla en este caso BloqCaps
bool mayusActivado = (((ushort)GetKeyState(0x14)) & 0xffff) != 0;