Please help! how to install the ODTwithODAC112030 in XPE OS?

we have a project using the entity framework,
we used to install ODTwithODAC to running our program.
now the run enviroment is XPE, when using the interface to query data from oracle, the program go error.
Does anyone know how to fix it?
XPE OS is similar with the XP, we install .netframework 4.0, and other programs run OK.
how to use the oracle entity framework without install ODTwithODAC on release version?
[The underlying provider failed on Open.]
at System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure)
at System.Data.EntityClient.EntityConnection.Open()
at System.Data.Objects.ObjectContext.EnsureConnection()
at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
at System.Data.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__3[TResult](IEnumerable`1 sequence)
at System.Data.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot)
at System.Data.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[S](Expression expression)
at System.Linq.Queryable.Count[TSource](IQueryable`1 source)
at ENPC.PVMonitor.DataAccess.UserManager.UsersImpl.Exist(String username, String password)

The problem is likely due to some connection problem to the Oracle DB. Perhaps you are missing the password in the config file or a port is being blocked by the Windows Firewall. There is no likely single cause since any single incorrect setting can prevent a valid connection.
If you google "The underlying provider failed on Open.", you will see the common ways people have resolved this issue.

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