Keyword Not Supported UNICODE in visual studio

Question

Hello,i'm Using Visual Studio 10 and as a back end using oracle 9 i,when i do operations on data like insert,update,delete through web form i got the error that keyword UNICODE is not supported. Please suggest me and Thanks in Advance.

I have wriiten my conncetion string as like,

<add name="conn"  connectionstring="Data Source=CGS1DB15; User ID=cgs1db; unicode=true"/>