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Control.SetTopLevel Method

Sets the control as the top-level control.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

protected function SetTopLevel(
	value : boolean
)

Parameters

value
Type: System.Boolean

true to set the control as the top-level control; otherwise, false.

ExceptionCondition
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 a null reference (Nothing in Visual Basic).

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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