How can I get the row count of the total number of rows in my DataTable across pages?

DSingh

For example, I have 50 rows in my table, and 20 of them get displayed on the 1st page, and 10 on the 2nd page. With my code I am only able to fetch the selected row values on the first page.
If I have no rows selected on the first page, but I do have selected rows on the 2nd page, it shows me an error that no row is selected and asks me to select a row to go the next webpage (since I am using validationEngine plugin for validating data)
Is there a way to get the total count of number of rows across the pages i.e. as in this example, for all 50 records in my DataTable?

I've tried all the suggestions and its getting really difficult for me to solve this problem.
Please help!