DRAG DROP
You are developing a custom collection named LoanCollection for a class named Loan class.
You need to ensure that you can process each Loan object in the LoanCollection collection
by using a foreach loop.
How should you complete the relevant code? (To answer, drag the appropriate code
segments to the correct locations in the answer area. Each code segment may be used
once, more than once, or not at all. You may need to drag the split bar between panes or
scroll to view content.)
Answer: 
:IEnumerable
public IEnumerator GetEnumerator()
return _loanCollection.GetEnumerator();
The “for loop” should be a dead giveaway for IEnumerable.
http://www.functionx.com/csharp3/Lesson29.htm
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:IEnumerable
public IEnumerator GetEnumerator()
return _loanCollection.GetEnumerator();