Adding a new row in a grid(interface)

Hi

I want to auto increment a user defined id in a grid when a new row is added.
I was able to increment the id but facing an issue...
Test scenario:
Add 2 new rows,delete the 1st row,
again add a new row.
In this scenario am getting the repeated id.
This is because i have used grid row index for id increment,
Please refer the attached screenshots for more details.

Can anybody suggest me how to handle this scenario.

Thanks in advance.

OriginalPostID-239262