Grid builded Programmatically: prob on update

[Blop]

Hello,
I'm building my radgridview programmatically. The source is datatable which I build too. 
When I'm in editmode (I use InPlace) how can I get the new data in the on the update?

I can retrieve the row of the edited item but how can I get the column?
I tried to do something like that:

 e.Item.DataItem("Unique_Name")

but I can't get it work... 

Can you help?
Thanx

[Blop]

With vb.net answer is :
 Dim txtbx As TextBox = CType(item("Unique_Name").Controls(0), TextBox)
 string = txtbx.Text