Thanks for your great help, i can raise some event, i'll have to find out how to use it effectively.

-Populate Datagrid: Did you restore dataview's Property 'RowFilter' to the value before filtering when you uncheck the CheckBox. I think you should implement something like this: DataView.RowFilter=CheckBox.Checked? [Your Filter Expression]:[The original RowFilter Expression(normally empty string)]; in the CheckChanged EventHandle; -Number of Records: did you mean Dataset.Tables[index].Rows.Count.It's independent of on RowFilter property. This number won't change until you Remove a Record from table (Not even Delete) by using Rows.Remove(),Rows.RemoveAt()...functions

Hi All! I want to write a program that can raise mouse click event( in other window or desktop), but i don't know how to raise that event.:(( Any Idea??