Application Configuration Files in VC# (App.config > <app>.exe.config)

I am creating a application configuration file. I am interested in using custom sections, not just the default <appSettings> section. I have created handlers to read the custom section shown below. I want to update or write back to sections in the configuration file. How can I do this?

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="TimeSpan">
<section
name="FromDateTime"
type="ConfigurationSectionObjects.DateTimeConfigHandler,AcuityTrendCharter"/>
<section
name="ToDateTime"
type="ConfigurationSectionObjects.DateTimeConfigHandler,AcuityTrendCharter"/>
</sectionGroup>
<section
name="DateTimeOfLastBackup"
type="ConfigurationSectionObjects.DateTimeConfigHandler,AcuityTrendCharter"/>
</configSections>
<TimeSpan>
<FromDateTime>
<Year>2005</Year>
<Month>8</Month>
<Day>1</Day>
<Hour>12</Hour>
<Minute>30</Minute>
</FromDateTime>
<ToDateTime>
<Year>2005</Year>
<Month>8</Month>
<Day>3</Day>
<Hour>12</Hour>
<Minute>30</Minute>
</ToDateTime>
</TimeSpan>
<DateTimeOfLastBackup>
<Year>2005</Year>
<Month>8</Month>
<Day>1</Day>
<Hour>12</Hour>
<Minute>30</Minute>
</DateTimeOfLastBackup>
<appSettings>
<add key="BackupDirectory" value=""/>
<add key="DatabaseDirectory" value="c:\\"/>
<add key="DatabaseFileName" value="transaction.mdb"/>
</appSettings>
</configuration>

All of the values above for TimeSpan, DateTimeOfLastBackup and all the values described in the <appSettings></appSettings> will require updating. I can successfully read the values in the sections above, but I do not know the direction to go on updating these values from the application.

Shown below, I additionally want to read these sections which have yet to be defined in the <configSections></configSections> section. I have a <TrendColors></TrendColors> section that has node-list of color elements with attributes. I also have a <Views></Views> section that has subsections, node list <ChildForm></ChildForm>, each ChildForm section having one attribute. And, each ChildForm section has Trend elements with multiple attibutes. How should I read these? None of the section-elements nor property-attributes below require updating from the application at this time.

[5914 byte] By [jmsigler2] at [2007-12-16]