benefits of object and frameworks

You bet!  In COBOL we make a lot of use of arrays.  A COBOL array is no different than a C# array or a Java array.  But – the .Net and Java Frameworks contain Collection classes that are like arrays on steroids.  Much of the programming effort we do to utilize arrays can be eliminated by creating a List collection object, or a Dictionary collection object and using it instead of a plain array.  You can do this in your existing COBOL programs with a single line of code.  Inserting/deleting/sorting/searching can then be done utilizing proven, tested Framework code rather than having to write, test, and maintain our own implementation.