Document   Is   |  
 Checks whether the family type id is valid for the give family category. 
 Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
public bool IsDefaultFamilyTypeIdValid(
	ElementId familyCategoryId,
	ElementId familyTypeId
) Parameters
- familyCategoryId ElementId
 - The family category id.
 - familyTypeId ElementId
 - The default family type id.
 
Return Value
BooleanTrue if the family type id is valid for the give family category, false otherwise.
| Exception | Condition | 
|---|---|
| ArgumentNullException | A non-optional argument was null |