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An Encrypted String Data Type for Visual Studio LightSwitch

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Learn how to extend support for Microsoft C#-only BlankExtension/BizType projects to Visual Basic.

In my recent article, " Is Visual Studio LightSwitch the New Access? ", I looked at the suitability of LightSwitch as a replacement tool for departmental applications developed in Microsoft Access. LightSwitch is being positioned as a tool for the power user to develop Microsoft .NET Framework applications without having to face the substantial learning curve of the full .NET technology stack. I described each of the six extension types available to add the functionality to LightSwitch that an experienced .NET developer might want to use to make development in LightSwitch easier, or that a designer may want to use to build a visually appealing application.

This article demonstrates the usefulness of LightSwitch extension points by showing how to build a custom business data type to provide automatic encryption to a database string field. Once installed, the "Encrypted String" field data type can be available for use in any table in a LightSwitch project with the extension enabled. When a field of the Encrypted String data type is used in a LightSwitch screen, the field automatically decrypts itself when the cursor enters the field and automatically encrypts itself whenever the cursor leaves the field. The LightSwitch developer can store sensitive information in the database in encrypted form with no more effort than selecting the "Encrypted String" data type when designing the table.

Figure 1 shows an example of a LightSwitch grid with two rows of data, each row having User Name and Password as the Encrypted String data type. The cursor is in the Password field of the first row, so it's shown and editable as plain text -- which is automatically encrypted when the cursor leaves the field. The Comments column shows the decrypted value of each field. The database sees and saves the field value in its encrypted form; be sure to allow sufficient length in the database field for the encrypted string value.

Installing and Using the Encrypted String Business Type
In order to run LightSwitch, you must be using Visual Studio Professional or higher with Service Pack 1 installed, and also the Visual Studio LightSwitch beta 2 (available for download here ). Beta 1 must be uninstalled before installing beta 2.

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