how to Make the Mouse Freeze c#

Question

i want the mouse to freez (cant move) when mouse down thanks

Answer 1

You can't.

Mouse acts in the OS Layer, not your app... even if you freeze your app, mouse will be able to run.

You can try to disconnect the mouse driver/port but you do need to ask the user what port the mouse is using as for the OS it's a Input device, just like a pen in a design board and you will not know the one to disconnect.