Hi, some controls don't need all the data all the time, they can run in virtual mode, needing only the data that is actually visible at any point in time. They fire an event when they need more data to show it. DataGrid is one of those controls. :) Luc Pattyn [Forum Guidelines] [My Articles] - before you ask a question here, search CodeProject, then Google - the quality and detail of your question reflects on the effectiveness of the help you are likely to get - use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets

Definitely; there's no data like emperical data.

I guess you don't know How to use google[^] If you did, you would find answer to your question with a simple search. Giorgi Dalakishvili #region signature my articles #endregion