c# - Events: How to keep eye on List Object properties -

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i have list activeacountlist of object (activeaccount). 

list<activeaccount> activeacountlist = new list<activeaccount>();

the object/activeaccount props/info key, name, account, amount, source , more properties.

i don't own object, been owned 3rd party , using event given them, fires when ever changes or added list. below event method fires every time when added or updated , using same event populating activeacountlist

private void getaccountlist(activeaccount activeaccountdata) {     if(!activeacountlist.contains(activeaccountdata.key))     {         activeacountlist.add(activeaccountdata);     }     else     {         activeacountlist[activeaccountdata.key] = activeaccountdata;     } }

now question is, there way can attach event fires every time when 'amount' changes? or if can keep eye on property , when ever changes event fires? keep in mind dont own object can not thing activeaccount class.

this solution should work. please check link


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