c# - Updating External system from excel -


It is obvious from a demo that I had seen before but did not get enough details

I'm creating a function call such as 

  = MyRTDReverse ("keyvalue", "fieldName", [AC51])

or

< Pre> = MyRTDReverse ("keyvalue", [AB51], [AC51]) // where AB51 is the name of the field and AC51 field value

etc.

While updating the value in cell AC51 triggers a change

How will this work but any samples / patterns?

Update - Using .NET 3.5+ VSTO Update 2 - Do not want to use VSTO and instead of routing calls like a UDF / RTT

< A cell, worksheet tag event: 

  Handle the private sub-worksheet tag (by-target as range), here's a goal, a range, your "triggers" cells, and if so, then agree to a cut To define functions:  
  functions do my stuff (arguments 1, argument 2) with your arguments, and set myFunction equally Return value end function  
 
 In a cell, you can then use the function such as  = MyFunction ("value", 3)

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