As the question suggest, SetBackgroundResource is used if you want to set the background of an image button according to an image, such as:
p1Cards[n].SetBackgroundResource(Resource.Drawable.b1fv);
where b1fv is the image file.
Therefore my question is, what is the appropriate command to get the background image? For example, if I want to check whether an imagebutton is using this certain background image, what is the command to use and check?