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Why DataGrid redraw EVERY visible cells on any action ?

I have made a simple test for the datagrid by using an inherited
DataGridTextBoxColumn named "DataGridTextBoxColumnEx". In the class I
override the Paint() method and inserted the code to count the number of
calls. For a 5 x 5 cells DataGrid it calls my Paint() method exactly 25
times on every action I done to the grid. That includes moving the grid
cursor, editing a single cell, calling the invalidate(rectangle rect) method
with the rectangle indicating just a very small area on the grid ... etc.

In my application I have a grid showing like 40x20 cells on the screen. It
paints every cells whenever a single piece of data has been updated. This
stupid behavier now become the no.1 performance bottlenet. Any people could
help ?
Feb 14 '06 #1
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