[ObsoleteAttribute("This method is deprecated in Revit 2017. Use View.SetCategoryHidden() instead.")]
public void SetVisibility(
	Category category,
	bool visible
)

<ObsoleteAttribute("This method is deprecated in Revit 2017. Use View.SetCategoryHidden() instead.")> _
Public Sub SetVisibility ( _
	category As Category, _
	visible As Boolean _
)

[ObsoleteAttribute(L"This method is deprecated in Revit 2017. Use View.SetCategoryHidden() instead.")]
public:
void SetVisibility(
	Category^ category, 
	bool visible
)

This affects only if the category is set visible or invisible individually. Other Revit mechanisms may also affect the visibility of elements of this category, including:

• the category classes settings for model categories, annotation categories, import categories or analytical model categories.
• view filters

Thus setting this value may not affect the actual visibility of elements of this category in the view.