OleDb - not getting up to date data from SharePoint

Question

I am having the following problem: 1.I connect to the OleDb data source (SharePoint list) 2. I select the data using the following code:

success = true;
message = "";
readData = new DataTable();
if(oledbConnection == null)
{
    success = false;
    message = "First establish connection with the oledb source.";
}
if(success == true)
{
    try
    {

            OleDbCommand command = new OleDbCommand(queryString, oledbConnection);
            command.CommandTimeout = (int)Convert.ToDecimal(timeout);
            OleDbDataReader reader = command.ExecuteReader();
            readData.Load(reader);
            command.Dispose();
            reader.Close();

    }
    catch (Exception ex)
    {
        success=false;
        message=ex.Message;
    }
}

3. I update the data on sharepoint using the same oledbConnection (still open).
4. I get back to point 2 - to read the updated data from SharePoint list still using the same oledbConnection (still open). But when the data is downloaded I cannot see the changes I've made.

The question is: How can I get the up to date data from sharepoint using the same conneciont (without closing it and reopening).