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WebBrowser.EncryptionLevel Property

Gets a value indicating the encryption method used by the document currently displayed in the WebBrowser control.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in

public WebBrowserEncryptionLevel EncryptionLevel { get; }
/** @property */
public WebBrowserEncryptionLevel get_EncryptionLevel ()

public function get EncryptionLevel () : WebBrowserEncryptionLevel

Not applicable.

Property Value

One of the WebBrowserEncryptionLevel values.

Exception typeCondition


This WebBrowser instance is no longer valid.


A reference to an implementation of the IWebBrowser2 interface could not be retrieved from the underlying ActiveX WebBrowser control.

You can use this property with the EncryptionLevelChanged event to implement an indicator in the user interface of your application similar to the lock icon in Internet Explorer. When the current document is not encrypted, the value of this property is WebBrowserEncryptionLevel.Insecure. When the WebBrowser control displays a Web page containing multiple frames with content of different encryption levels, the value of this property is WebBrowserEncryptionLevel.Mixed. When the encryption level is unknown, the value of this property is WebBrowserEncryptionLevel.Unknown. Other values indicate the type of encryption present. To mimic the behavior of the lock icon in Internet Explorer, display the encryption type in a ToolTip that appears when the mouse pointer hovers over the indicator.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0