Determines whether two elements are joined. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2014 
Syntax
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Parameters
- document
 -  Type:  Autodesk.Revit.DB Document  
The document containing the two elements. 
- firstElement
 -  Type:  Autodesk.Revit.DB Element  
The first element. 
- secondElement
 -  Type:  Autodesk.Revit.DB Element  
The second element. 
Return Value
True if the two elements are joined.Remarks
 This functionality is not available for family documents. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | document is not a project document. -or- The element firstElement was not found in the given document. -or- The element secondElement was not found in the given document. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |