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ConfigurationElementCollection.BaseAdd Method (ConfigurationElement, Boolean)

Adds a configuration element to the configuration element collection.

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

protected internal void BaseAdd(
	ConfigurationElement element,
	bool throwIfExists


Type: System.Configuration.ConfigurationElement

The ConfigurationElement to add.

Type: System.Boolean

true to throw an exception if the ConfigurationElement specified is already contained in the ConfigurationElementCollection; otherwise, false.


The ConfigurationElement to add already exists in the ConfigurationElementCollection and the throwIfExists parameter is true.

Use the optional parameter throwIfExists to throw an Exception exception if the specified ConfigurationElement object already exists in the ConfigurationElementCollection collection.

An element is considered a duplicate only if the keys are identical but the values are different. Elements with identical keys and values are accepted silently because the elements do not compete. However, an element with an identical key but a different value cannot be added because there is no logic to determine which of the competing values should be honored.

.NET Framework

Supported in: 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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