.net library: how to insert accented chars in cells?

[Alberto Velo]

Hello,
I'm new  to Google APIs, and am trying to populate a spreadsheet from a 
.net app of mine, using google data api.
I can access my spreadsheet and read/write data, but when I put special 
chars (e.g. à è ì ò ù) in cells I see they are wrongly encoded: for example 
a "è" becomes "è" when I open my spreadsheet via browser.

I put values in cells just like strings, for example:

CellEntry newentry = new CellEntry(rownumber, columnnumber, "my string"); 
cellFeed.Insert(newentry);

Is there a way to correctly encode my strings?

Thanks for any help,
al.