DefaultSettingValueAttribute Class
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DefaultSettingValueAttribute Class


Specifies the default value for an application settings property.

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


public sealed class DefaultSettingValueAttribute : Attribute


Initializes an instance of the DefaultSettingValueAttribute class.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


Gets the default value for the application settings property.


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)


DefaultSettingValueAttribute can only be applied to individual settings properties; it is invalid to apply this attribute to an entire application settings class.

Different settings providers may have different requirements or limitations on the use of the DefaultSettingValueAttribute. For example, the LocalFileSettingsProvider does not require this attribute, and will override any value provided by this attribute if there are any values—default or user-modified— already present in the data store.

DefaultSettingValueAttribute requires that the default value can be represented as a string. As a result, settings using XML serialization cannot have a default value specified by means of this attribute. Some providers may choose to support multiple serialization schemes which can be specified at compile time using the SettingsSerializeAsAttribute.


The default values specified by this attribute are stored as plain text in the resultant compiled .exe or .dll file. Therefore these default values are inherently insecure.

The following code example demonstrates the use of the DefaultSettingValueAttribute applied to three of the four properties of the FormSettings wrapper class, which is derived from the ApplicationSettingsBase class. This class is used to persist the location, size, background color, and text of form. The first three of these form properties have default values associated with them.

The full code example is listed in the ApplicationSettingsBase class overview.

//Application settings wrapper class
sealed class FormSettings : ApplicationSettingsBase
    public String FormText
        get { return (String)this["FormText"]; }
        set { this["FormText"] = value; }

    [DefaultSettingValueAttribute("0, 0")]
    public Point FormLocation
        get { return (Point)(this["FormLocation"]); }
        set { this["FormLocation"] = value; }

    [DefaultSettingValueAttribute("225, 200")]
    public Size FormSize
        get { return (Size)this["FormSize"]; }
        set { this["FormSize"] = value; }

    public Color FormBackColor
        get { return (Color)this["FormBackColor"]; }
        set { this["FormBackColor"] = value; }


.NET Framework
Available since 2.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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