VB.NET
* Public Class Form1

Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Label1.Text = "안녕하세요"

End Sub

Private Sub Label1_MouseHover(ByVal sender As Object, ByVal e As System.EventArgs) Handles Label1.MouseHover, MyBase.MouseHover
Label1.Text = "마우스 움직이지 마세요?"
End Sub
End Class 
마우스 이벤트 mousehover