Control::SetTopLevel Method
Sets the control as the top-level control.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Parameters
- value
- Type: System::Boolean
true to set the control as the top-level control; otherwise, false.
| Exception | Condition |
|---|---|
| InvalidOperationException | The value parameter is set to true and the control is an ActiveX control. |
| Exception | The GetTopLevel return value is not equal to the value parameter and the Parent property is not nullptr. |
If you call the SetTopLevel method of a Form and pass in a value of false, the form will not be visible until you call SetTopLevel again, passing in a value of true.
- UIPermission
to set the control as a top-level control if it is of type Form. This permission is only demanded if the value parameter is true and the control is not an ActiveX control. Associated enumeration: SafeTopLevelWindows value of UIPermissionWindow.
- UIPermission
to set the control as a top-level control if it is of any type other than Form. This permission is only demanded if the value parameter is true and the control is not an ActiveX control. Associated enumeration: AllWindows value of UIPermissionWindow.
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
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.