System.Windows.Forms 1.0.5000.0 2.0.0.0 System.Enum System.Runtime.InteropServices.ComVisible(true) System.Flags This enumeration is used by many classes, including , , , , , , , and . Specifies constants that define which mouse button was pressed. Field System.Windows.Forms.MouseButtons The left mouse button was pressed. 1.0.5000.0 2.0.0.0 Field System.Windows.Forms.MouseButtons The middle mouse button was pressed. 1.0.5000.0 2.0.0.0 Field System.Windows.Forms.MouseButtons No mouse button was pressed. 1.0.5000.0 2.0.0.0 Field System.Windows.Forms.MouseButtons The right mouse button was pressed. 1.0.5000.0 2.0.0.0 Field System.Windows.Forms.MouseButtons With Windows 2000, Microsoft is introducing support for the Microsoft IntelliMouse Explorer, which is a mouse with five buttons. The two new mouse buttons (XBUTTON1 and XBUTTON2) provide backward/forward navigation. The first XButton was pressed. 1.0.5000.0 2.0.0.0 Field System.Windows.Forms.MouseButtons With Windows 2000, Microsoft is introducing support for the Microsoft IntelliMouse Explorer, which is a mouse with five buttons. The two new mouse buttons (XBUTTON1 and XBUTTON2) provide backward/forward navigation. The second XButton was pressed. 1.0.5000.0 2.0.0.0