Control::TopLevelControl Property
Gets the parent control that is not parented by another Windows Forms control. Typically, this is the outermost Form that the control is contained in.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The top-level control is defined as the parent control that is not parented by another Windows Forms control. Typically, this is the outermost Form that the control is contained in. For example, if the control is contained on an MDI child Form, then the top-level control is the Multiple Document Interface (MDI) parent Form. If the control is not parented on a Form, this property will return nullptr.
- UIPermission
for all windows to get this property value. Associated enumeration: UIPermissionWindow::AllWindows
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.