C# Add-In: Overwrite 3rd Party embedded image at opening or using idw

[Anonymous]

Hello!

I would like to create an add-in, that can create and/or refresh an image on a drawing dinamically, or at opening time.

I must create QR, Barcode and Datamatrix on drawings. It must contain the "Part Number" iProperty only.

I have the methods to create them as image (in memory), but I must overwrite the existing images with this.
Usually I use C# only but I can understand or use VB codes. 

In summary:
 - How can I create to auto-execution? (OnOpen event?)

 - How to overwrite images, that phisically not exist in the folder?

(As an image on hard drive, just in 3rd Party embedded list like a virtual folder)

 - Is there any other solution to get "Part Number" iProperty?

I found only this method for get iProperty (I placed everithing in one line):

((Inventor.Application)System.Activator.CreateInstance((Type.GetTypeFromProgID("Inventor.Application")))).ActiveDocument.PropertySets["Design Tracking Properties"].customPropSet.ItemByPropId[5].Value

Can anybody help me?

Thank You for your answer!