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show some unnecessary null row in grid's cell

column type is 'txt, after data in cell is saved database, next time, the data will show some unnecessary blank space line in grid's cell.why?

If you are loading data from XML - please beware that new line feeds will be treated as part of data, so just form XML as single lin

Instead of
<cell> 
   value 
</cell>

use
<cell>  value  </cell>