How to setup auto increment for Service-Based Database

问题

I start build my first local database (Service-Based Database) here Write line to Service-Based Database with textbox, need your help with setup, so I want to set my auto increment in my Properties Identity Specification which is True now, or use some sorting method, thus if any row is removed, second one (next after deleted) must take index of deleted line, and of course same step back for all subsequent rows, and also important, if I have to use any sorting, to keep original order of lines as it was inserted.

For example:

1. line 1
2. line 2
3. line 3
4. line 4

If line2 is deleted this result:

1. line 1
2. line 3
3. line 4

If all lines deleted, and then inserted new index becomes 1. new first line and not 5. new first line as it now.

来源：https://stackoverflow.com/questions/39155743/how-to-setup-auto-increment-for-service-based-database