How does List.IndexOf() perform comparisons on custom objects?

Question

I wrote a class of account objects and hold a static List of those account objects. My program loops through each account in the list, performing some

Answer 1

Another option is to use List.FindIndex, and pass a predicate. That is:

if ((index = AccountList.FindIndex(a => a.name == account.name)) >= 0)
    AccountList[index] = account;

That way you can search on any arbitrary field or number of fields. This is especially useful if you don't have access to the source code for Account to add an overloaded Equals method.