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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:
void SetTopLevel (
	bool value
)
protected void SetTopLevel (
	boolean value
)
protected function SetTopLevel (
	value : boolean
)
Not applicable.

Parameters

value

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

Exception typeCondition

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 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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