To add a custom configuration section to a project:

• Add a reference to System.Configuration.dll
• Add to your app.config:

  <configuration>
    <configSections>
      <section name="myConfiguration"
         type="MyProject.MyConfiguration, MyProject" />
    </configSections>
    <myConfiguration
      emailTo="MyEmailAddress@domain.com"
    />
  </configuration>

• Add the class MyConfiguration.cs:

  using System;
  using System.Configuration;
   
  namespace MyProject
  {
      class MyConfiguration : ConfigurationSection
      {
          public static MyConfiguration Current
          {
              get { return ConfigurationManager.GetSection("myConfiguration") 
                                as MyConfiguration; }
          }
   
          [ConfigurationProperty("emailTo")]
          public string EmailTo
          {
              get { return (string)this["emailTo"]; }
              set { this["emailTo"] = value; }
          }
   
      }
  }

• To use in code:

  Trace.WriteLine(MyConfiguration.Current.EmailTo);