i have a really strange problem to get connected to Oracle (11g) using VisualStudio2010
#1) a Winforms application creates an OleDBCOnnection using an .udl File as connection string. Connection.Open() works perfectly without any problem.
#2) a WPF application creates an OleDBCOnnection using the same .udl File ('test connection' is working). Connection.Open() raises an exception "OraOLEDB.Oracle.1 Provider is not registered on the local machine".