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A challenge that occurs with anonymous profiles is what to do with the profile information when a previously anonymous user logs in. For example, in an e-commerce website a user might select several items and then register or log in to complete the transaction. At this point, you need to make sure the shopping cart information is copied from the anonymous user s profile to the appropriate authenticated (user) profile. Fortunately, ASP.NET provides a solution through the ProfileModule.MigrateAnonymous event. This event (which can be handled in the global.asax file) fires whenever an anonymous identifier is available (either as a cookie or in the URL if you re using cookieless mode) and the current user is authenticated. The basic technique when handling the MigrateAnonymous event is to load the profile for the anonymous user by calling Profile.GetProfile() and passing in the anonymous ID, which is provided to your event handler through the ProfileMigrateEventArgs. Once you ve loaded this data, you can then transfer the settings to the new profile manually. You can choose to transfer as few or as many settings as you want, and you can perform any other processing that s required. Finally, your code should remove the anonymous profile data from the database and clear the anonymous identifier so the MigrateAnonymous event won t fire again. void Profile_MigrateAnonymous(Object sender, ProfileMigrateEventArgs pe) { // Get the anonymous profile. ProfileCommon anonProfile = Profile.GetProfile(pe.AnonymousID); // Copy information to the authenticated profile // (but only if there's information there). if (anonProfile.Address.Name != null || anonProfile.Address.Name != "") {

The job of updating profile properties in the SetPropertyValues() is just as straightforward as reading property values. This time, the update stored procedure is used, and every supplied value is translated into a parameter with the same name. Here s the complete code: public override void SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection values) { // Prepare the command. SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(updateProcedure, con); cmd.CommandType = CommandType.StoredProcedure; // Add the parameters. // The assumption is that every property maps exactly // to a single stored procedure parameter name. foreach (SettingsPropertyValue value in values) { cmd.Parameters.Add(new SqlParameter(value.Name, value.PropertyValue)); } // Again, this provider assumes the stored procedure accepts a parameter named // @UserName. cmd.Parameters.Add(new SqlParameter("@UserName", (string)context["UserName"])); // Execute the command. try { con.Open(); cmd.ExecuteNonQuery(); } finally { con.Close(); } } This completes the code you need for the simple implementation of the FactoredProfileProvider.

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Now you can create a Web page for testing the class you created previously. Just create a page that allows you to generate a key and enter clear-text data through a text box. You can output the encrypted data through Convert.ToBase64String() easily. For decryption, you just need to revert the operation through Convert.FromBase64String() to get the encrypted bytes back and pass them into the DecryptData method. Dim KeyFileName As String Dim AlgorithmName As String = "DES" Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) SymmetricEncryptionUtility.AlgorithmName = AlgorithmName KeyFileName = Server.MapPath("~/") & "\symmetric_key.config" End Sub Protected Sub GenerateKeyCommand_Click(ByVal sender As Object, ByVal e As EventArgs) SymmetricEncryptionUtility.ProtectKey = EncryptKeyCheck.Checked SymmetricEncryptionUtility.GenerateKey(KeyFileName) Response.Write("Key generated successfully!") End Sub Protected Sub EncryptCommand_Click(ByVal sender As Object, ByVal e As EventArgs) ' Check for encryption key If (Not File.Exists(KeyFileName)) Then Response.Write("Missing encryption key. Please generate key!") End If Dim data As Byte() = SymmetricEncryptionUtility.EncryptData(ClearDataText.Text, KeyFileName) EncryptedDataText.Text = Convert.ToBase64String(data) End Sub Protected Sub DecryptCommand_Click(ByVal sender As Object, ByVal e As EventArgs) ' Check for encryption key If (Not File.Exists(KeyFileName)) Then Response.Write("Missing encryption key. Please generate key!") End If Dim data As Byte() = Convert.FromBase64String(EncryptedDataText.Text)

Profile.Address = anonProfile.Address; } // Delete the anonymous profile from the database. // (You could decide to skip this step to increase performance // if you have a dedicated job scheduled on the database server // to remove old anonymous profiles.) System.Web.Profile.ProfileManager.DeleteProfile(pe.AnonymousID); // Remove the anonymous identifier. AnonymousIdentificationModule.ClearAnonymousIdentifier(); } You need to handle this task with some caution. If you ve enabled anonymous identification, every time a user logs in, the MigrateAnonymous event fires, even if the user hasn t entered any information into the anonymous profile. That s a problem, because if you re not careful, you could easily overwrite the real (saved) profile for the user with the blank anonymous profile. The problem is further complicated because complex types (such as the Address object) are created automatically by the ProfileModule, so you can t just check for a null reference to determine whether the user has anonymous address information. In the previous example, the code tests for a missing Name property in the Address object. If this information isn t a part of the anonymous profile, no information is migrated. A more sophisticated example might test for individual properties separately or might migrate an anonymous profile only if the information in the user profile is missing or out of date.

If you want to mimic the behavior of the SqlProfileProvider, you should also update the database with the last update time whenever the SetPropertyValues() method is called.

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