c# - Handle multiple SampleGrabber -

I have created a sample that has two sample grayscards. When I want to set the callback function, I use this code as a sample For both:

  SetCallback (this, 1);   
 SampleGrabbers use both my buffer's functions. When I get a frame in the buffer CB function, how can I understand that the first sample is for the second or the second one?  
 Any thoughts?  
 Thank you   
 
 
 To differentiate between weapons, you need to implement your callback Different examples of the object having the required are required.  
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