Question

Using this event the label just disappears, how should I do this?

    private void label4_MouseMove(object sender, MouseEventArgs e)
    {
        label4.Location = new Point(Cursor.Position.X, Cursor.Position.Y);
    }

Answer 1

The location of label4 is relative to the container (Form or parent control), Cursor position may be relative to the screen.

You need to adjust the location. For example, if the container is the Form you can find its location in the screen and calculate by it the location of the cursor relative to screen.

This is only one possibility for the cause, but this one is happens a lot 🙂