[Mono-dev] Mono 3 insert quotation marks instead of special chars in SQL Server

[APS]

Hi,

I'm using mono 3 for an asp.net web application 
and inserting or updating data in an SQL Server 
database, if I enter special characters like 'à' 
they are inserted as '?' inside the database.
Is probably a conversion issue with UTF8 but how 
can I handle it? I tried with an old mono 2 and 
the characters has been inserted correctly.
Any hint?