Control.SetTopLevel Method (Boolean)

 

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
)

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 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 SetTopLevelagain, 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.

.NET Framework
Available since 1.1
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