Control.SetTopLevel Method
Sets the control as the top-level control.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
| 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 null. |
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.
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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.
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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 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.
