Adds the specified vector to this vector and returns the result. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
| C# | 
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| Visual Basic | 
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| Visual C++ | 
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Parameters
- source
-  Type:  Autodesk.Revit.DB XYZ  
 The vector to add to this vector.
Return Value
The vector equal to the sum of the two vectors.Remarks
 The added vector is obtained by adding each coordinate of the specified vector to the corresponding coordinate of this vector. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | Thrown when source is a null reference ( Nothing in Visual Basic) . |