' Modify a custom section. Show how to use the
 ' OpenExeConfiguration(ConfigurationUserLevel) method.
Shared Sub ModifyCustomSection()
   ' Get the application configuration file.
     Dim config As System.Configuration.Configuration = _
     ConfigurationManager.OpenExeConfiguration( _
     ConfigurationUserLevel.None)
   
   Console.WriteLine(config.FilePath)
   
     Dim custSection As CustomSection = _
     config.Sections(customSectionName)
   
   custSection.FileName = "newName.txt"
   custSection.MaxIdleTime = New TimeSpan(0, 15, 0)
   custSection.MaxUsers = custSection.MaxUsers + 10
   
   If Not custSection.ElementInformation.IsLocked Then
      config.Save()
   Else
      Console.WriteLine("Section was locked, could not update.")
   End If
End Sub 'ModifyCustomSection

// Modify a custom section. Show how to use the
// OpenExeConfiguration(ConfigurationUserLevel) method.
static void ModifyCustomSection()
{
    // Get the application configuration file.
    System.Configuration.Configuration config =
            ConfigurationManager.OpenExeConfiguration(
            ConfigurationUserLevel.None);

    Console.WriteLine(config.FilePath);

    CustomSection custSection =
       config.Sections[customSectionName] as CustomSection;

    custSection.FileName = "newName.txt";
    custSection.MaxIdleTime = new TimeSpan(0, 15, 0);
    custSection.MaxUsers = custSection.MaxUsers + 10;

    if (!custSection.ElementInformation.IsLocked)
        config.Save();
    else
        Console.WriteLine("Section was locked, could not update.");