Continuosly running DataGrid should show the latest entries

Hi,
I am using a DataGrid control in my project,. I am Updating it Using a Backgground worker. I implemented a auto Scroll functionality so that it is showing latest entry it always scrolls down until user changed the position of scroll. But the my problem is
the Rows is a Datagrid are not properly visible means they are moving at the rate of 500 per second, so user cant see the rows.
Here my requirement is Rows Should be visible to user properly at the same time Datagrid should update Continuously.
I have been searching for this. I saw the term Flickering , I didn't understand what it means? Is it refers to my problem?
how can I achieve this?

Why are you presenting 500 rows anyhow?
The maximum a user should have to look through is around 300.
Any more and you should have some sort of filtering so they can pick a specific group or latest or whatever.
If you mean you're adding 500 rows a second then you have a problem.
The user can't possibly read 500 lines of anything each second so the basic design is faulted.
How fast does whatever you're showing change?
What is the user going to do with the data in the datagrid?
If you mean you're refreshing the datagrid because some values change somewhere in the collection then implement inotifypropertychanged on the t of the observablecollection<t> you have bound to the itemssource of your datagrid.
Hope that helps.
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Continuosly running DataGrid should show the latest entries

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