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.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.