Sort column in dataview

[Ator]

Hello

I have a column in a dataview that I want to sort.
The datatype is string.

The values are like:
"0 %"
"10.2 %"
etc

How do I implement sorting on values like those? I can not convert the datatype to int (and skip %).

But if I have int's, you sort like "dataview.sort = 'mycolumn DESC'".
Now I want integer sorting on those strings above.

Does anyone have information about how to implement this sort?
(Im using VS2003)

Thanks!