Update DB from datagridview

[csharp learner]

I've populated the datagridview with an excel sheet and now i want to update the datagridview to a similiar table at Oracle DB.

        private void updateOracleBtn_Click(object sender, EventArgs e)
        {
                int connectionCounter = 0;
                bool boolUpdateData = true;
                while (boolUpdateData && connectionCounter < 3)
                {
                    try
                    {
                        localConnection = new OracleConnection(localFunction.localConnectionString);
                        localConnection.Open();

                        boolUpdateData = false;
                    }
                    catch (Exception localException)
                    {
                        localFunction.WriteEventLog(localException.ToString(), "OPCAlarmConfig");
                    }
                    connectionCounter++;
                }
}

I have establish a connection with the Oracle database...wher e should i proceed to do next?

Any help or advice is appreciated.