ODP.NET

Here's the situation.
If I use ODP. NET to fetch a REF_CURSOR from a procedure in a package it works without a hitch.

If I use ODP .NET to execute an Oracle function that returns a REF CURSOR, all sorts of things go wrong.
I am using .NET 3.5 and ODP .NET version 2.112.1.2 (11 G). My Oracle Database is 9.2.0.7.0

There is this function that returns a REF CURSOR.
The code looks like something like this.

CREATE OR REPLACE FUNCTION SENDMEAREFCURSOR RETURN SYS_REFCURSOR IS
  X_REF genPkg.genericcursor;
BEGIN
  OPEN X_REF for
    SELECT customer_id, name FROM CUSTOMERS;
  Return X_REF;
END;

The .NET code looks like this. This is after some tweaking.

        private static OracleDataReader FireMyFunc(OracleConnection oc)
        {
            try
            {
                OracleCommand cmd = new OracleCommand();
                cmd.Connection = oc;
                //cmd.CommandText = "SELECT sendmearefcursor FROM DUAL";
                //cmd.CommandType = System.Data.CommandType.Text;
                cmd.CommandText = "sendmearefcursor";
                cmd.CommandType = CommandType.StoredProcedure;
                OracleParameter prm = cmd.CreateParameter();
                prm.OracleDbType = OracleDbType.RefCursor;
                prm.ParameterName = "returncurse";
                prm.Direction = ParameterDirection.ReturnValue;
                cmd.Parameters.Add(prm);
                cmd.ExecuteNonQuery();
                return (OracleDataReader) prm.Value; //Throws an UnableToCast exception.
            }
            catch (System.Exception ex)
            {
               Console.WriteLine(String.Format("FireMyFunc: {0}",ex.ToString()));
                throw;
            }
        }

What do I need to do in order to get the refCursor?