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ConnectionStringSettingsCollection.Clear Method

Removes all the ConnectionStringSettings objects from the collection.

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

public void Clear()

The Clear method removes all the connection strings from the configuration file at the current configuration hierarchy level and writes a <clear> tag in the file. The <clear> tag signifies that all the connection strings defined in the parent configuration files are disregarded by the system.

The following example shows how to remove all the ConnectionStringSettings objects from the ConnectionStringSettingsCollection collection.

// Clear connection strings collection. 
static void ClearConnectionStrings()

    // Get the configuration file.
    System.Configuration.Configuration config =

    // Clear the connection strings collection.
    ConnectionStringsSection csSection =

    // Save the configuration file.

    Console.WriteLine("Connection strings cleared.");


.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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