Gets a value that enables child controls to be visible.
Assembly: System.Web (in System.Web.dll)
An attempt was made to assign a value to the property.
The WebPartManager control overrides the base Control.Visible property to always return a value of true for the property. Even though the WebPartManager control itself is not visible, the property needs to be set to true so that all its child controls are visible by default.
If you try to set the value of the property, it always generates an error because the WebPartManager control has overridden the base property behavior and prevents assigning any value to the property.
This property is not bindable in visual designers, but is bindable at runtime. For more information, see BindableAttribute.