Starting in Visual Studio 2008 SP1, you can specify .NET Framework 3.5 SP1 as an application target. However, .NET Framework 3.5 SP1 is not available on the Target Framework drop-down list. Therefore, for applications in which you want to specifically target .NET Framework 3.5 SP1, you must either add a reference to the new System.Data.Entity.dll assembly or perform one of the following actions that enable an SP1 ClickOnce feature in Visual Studio 2008 SP1:
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Specify an Error URL.
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Specify an Suite name.
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Create a desktop shortcut.
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Exclude a file from the hash in the Application Files dialog box.
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Clear Sign the ClickOnce manifests on the Signing page.
When you take one of these actions, Visual Studio 2008 SP1 will automatically target .NET Framework 3.5 SP1. For more information, see "Targeting .NET Framework Version 3.5 SP1" in How to: Target a Specific .NET Framework.
