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The CustomProviderDataAttribute.CustomProviderData property value is set using the customProviderData attribute of the add configuration element for adding profile properties. The CustomProviderDataAttribute.CustomProviderData property can be set to any string value to be used by the profile provider for the property. If the customProviderData attribute is set, then the value is placed in the System.Configuration.SettingsProperty.Attributes collection for the property and is indexed by the name "CustomProviderData."