Gets or sets a value indicating whether to display the form as a top-level window.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
A Multiple-document interface (MDI) parent form must be a top-level window.
The following code example use the Modal property to determine if a form is displayed as a modal form. If it is not the FormBorderStyle and properties are changed to make the form non-top-level form with a tool window border.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.