Non riesco a capire perchè ma non mi accetta la stringa di connessione:

Driver={SQL Server}; Server=local; Database=pippo; Trusted_Connection=yes;

codice:
Stack :


Parola chiave 'driver' non supportata. -    at System.Data.Common.DBConnectionString.ParseInternal(Char[] connectionString, UdlSupport checkForUdl, NameValuePair& keychain)
   at System.Data.Common.DBConnectionString..ctor(String connectionString, UdlSupport checkForUdl)
   at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
   at System.Data.SqlClient.SqlConnectionString.ParseString(String connectionString)
   at System.Data.SqlClient.SqlConnection.set_ConnectionString(String value)
   at System.Data.SqlClient.SqlConnection..ctor(String connectionString)
   Connetti() 
... in line 34