error in connection c# with oracle 11 XE

Question

hi , i have error in connection c# with oracle 11g express edition i put my connection string in app.config file "<add name="ConnectionString" connectionString="Provider=MSDAORA;Data Source=localhost;Password=LIB314;User ID=LIB_DB" providerName="System.Data.OleDb" />"
when i want to run a query it gives me error says "The 'MSDAORA' provider is not registered on the local machine" , i use windows 8.1 pro x64 ... any can help me please?