My code reads through an XML file and takes information from those tags and puts it into the corresponding RTC links.
However it does not check whether an item already exists in RTC leading to multiples of work items appearing in the links.

For example if my XML has work items of ID 1234 & 1235 in a depends tag and RTC has a work item of id 1234 in the depends On tag it should only write 1235 not both otherwise 1234 becomes duplicated.

I would greatly appreciate any help with how to check and compare my xml items to my RTC items to stop this from happening.