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Configuration.AppSettings Property

Gets the AppSettingsSection object configuration section that applies to this Configuration object.

Namespace:  System.Configuration
Assembly:  System.Configuration (in System.Configuration.dll)

public AppSettingsSection AppSettings { get; }

Property Value

Type: System.Configuration.AppSettingsSection
An AppSettingsSection object representing the appSettings configuration section that applies to this Configuration object.

Use the AppSettings property to access and change the appSettings configuration section defined by default in the open configuration file.

The following code example demonstrates how to use the AppSettings property.

    AppSettingsSection appSettings =
        config.AppSettings as AppSettingsSection;
    Console.WriteLine("Section name: {0}",

    // Get the AppSettings section elements.
    Console.WriteLine("Using AppSettings property.");
    Console.WriteLine("Application settings:");
    // Get the KeyValueConfigurationCollection  
    // from the configuration.
    KeyValueConfigurationCollection settings =

    // Display each KeyValueConfigurationElement. 
    foreach (KeyValueConfigurationElement keyValueElement in settings)
        Console.WriteLine("Key: {0}", keyValueElement.Key);
        Console.WriteLine("Value: {0}", keyValueElement.Value);
catch (ConfigurationErrorsException e)
    Console.WriteLine("Using AppSettings property: {0}",

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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