Ado.net OracleCommand does not throw timeout exception (executing stored procedure)

Question

I am executing a ORACLE Stored procedure using System.OracleClient.OracleCommand and set CommandTimeout = 5; (for example)

But I want to set a timeout such that if the command object execution takes more than say 5 minutes it should get aborted (getting exception...OracleException) so that I can show an error message to the user. Let me know how can this be done. This is my written code example.

    try
    {
        _dbConnectionString.Open();               
        var cmdOracle = new OracleCommand("hfghgh", _dbConnectionString)
        {
            CommandType = CommandType.StoredProcedure
        };
        OracleCommandBuilder.DeriveParameters(cmdOracle);               
        cmdOracle.Parameters["inputParam"].Value = 1;                
        tran =_dbConnectionString.BeginTransaction(IsolationLevel.ReadCommitted);
        cmdOracle.Transaction = tran;
        cmdOracle.CommandTimeout = 5;

        await cmdOracle.ExecuteNonQueryAsync();
        tran.Commit();
        return res = cmdOracle.Parameters["outputParam"].Value.ToString();
    }
    catch (OracleException ex)
    {
        dynamic exOra = ex;
        int errorNo = exOra.Number;
        if (errorNo == 01013)
        {
            throw new ResponseFailException(ex);
        }
        else
        {
            throw ex;
        }
    }