Control::SetTopLevel Method (Boolean)
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 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.
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.
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.
Available since 1.1