You can add your own configuration sections in Web.config or App.config file. There might be some good way to do it, if so, please let me know.

Step 1

Add the follwing inside <configSections> tag:

<configSections>

    <section name ="customSection" type ="System.Configuration.NameValueSectionHandler"/>

</configSections>

Step 2

Add your custom section before or after <appSettings> but after <configSections>

<customSection>

  <add key="key1" value="value1" />

  <add key="key2" value="value2" />

</customSection>

Your app.config will be like this

 ---------------------------------------------------------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <configSections>

      <section name ="customSection" type ="System.Configuration.NameValueSectionHandler"/>

  </configSections>

  <!--<Custom Seciton>-->

<customSection>

  <add key="key1" value="value1" />

  <add key="key2" value="value2" />

</customSection>

 <appSettings>

    <add key="tesing" value="abc" />

 </appSettings>

  <system.web>

  </system.web>

</configuration>

  --------------------------------------------------------------------------------------------------------------

Step 3

How to access it?

NameValueCollection colCustomSection = (NameValueCollection)ConfigurationManager.GetSection("customSection");

string key, value;

for (int count = 0; count < colCustomSection.Count; count++)

{

   // we can get the keys

   key = colCustomSection.GetKey(count);

   // we can get the values

   value = colCustomSection.Get(count);

}

To add multiple sections

Add this inside <configSections>

<configSections>

<sectionGroup name ="customSectionGroup">

    <section name ="customSection1" type ="System.Configuration.NameValueSectionHandler"/>

    <section name ="customSection2" type ="System.Configuration.NameValueSectionHandler"/>

</sectionGroup>

</configSections>

Add this around your custom section:

<customSectionGroup>

<customSection1>

  <add key="key1" value="value1" />

  <add key="key2" value="value2" />

</customSection1>

<customSection2>

  <add key="key1" value="value1" />

  <add key="key2" value="value2" />

</customSection2>

</customSectionGroup>

To access it, just change the path:

NameValueCollection colCustomSection = (NameValueCollection)ConfigurationManager.GetSection("customSectionGroup/customSection1");

customSectionGroup/customSection1 or customSectionGroup/customSection2