OleDbCommand oCmd = new OleDbCommand(Sqlselect, oConnection);
OleDbDataReader oReader = null;
string loginName = string.Empty;
string countryName = string.Empty;
try
{
    oConnection.Open();
    oReader = oCmd.ExecuteReader();
    while (oReader.Read())
    {
        if (!Convert.IsDBNull(oReader["LOGIN_NAME"]))
        {
            loginName  += oReader["LOGIN_NAME"].ToString();
        }
    }
    oReader.NextResult();   
    while (oReader.Read())
    {
       if (!Convert.IsDBNull(oReader["COUNTRY_NAME"]))
        {
            countryName  += oReader["COUNTRY_NAME"].ToString();
        }
    }
}
catch (Exception)
{ }
finally
{
    if (oReader != null)
    {
        oReader.Close();
    }
    if (oConnection != null)
    {
        oConnection.Close();
    }
}