使用C＃中的主键将行插入数据库的最佳方法是什么？

Sorry for my vague-ish title. Basically, I have a Call Logging app that uses a database with 2 tables (Customer and Records) to add, remove and search for records. I have a column in Records called 'CallID' that I use to help keep the calls unique and so I can use the CallID to Remove specific records. However, the problem lies on my adding call function. I currently have it so that the CallID is the number of items in the list incremented by 1:Sorry for my vague-ish title. Basically, I have