Grouping Properties in VB.NET

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Grouping Properties
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You also have the ability to add a <group> element within your profile schema. The <group> element enables you to categorize related properties. Grouping properties are helpful in that you have the ability to arrange related properties to one customized grouping. This will allow for easier use with the code. Here is an actual code example: <configuration> <system.web> <profile enabled="true" > <properties> <add name="FavoriteBackgroundColor" type="System.Drawing.Color" /> <group name="Font">
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<add name="Bold" type="bool"/> <add name="Underline" type="bool"/> </group> </properties> </profile> </system.web> </configuration> More specifically, let s look at the group element: <group name="Font"> <add name="Bold" type="bool"/> <add name="Underline" type="bool"/> </group> Here you have a group named Font that has defined properties of Bold and Underline. This adds some additional functionality to categorize your properties within the user profile.
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The information that is specified in the user profiles needs to be stored somewhere in your application. Luckily, the .NET Framework handles a great deal of this for you in that if your application allows the default provider to handle the storage, you do not have to implement any additional code or configurations for user profiles. A provider is where the profile information will be stored and later retrieved. This is commonly a database that is already supplied, and you will not have to be concerned about constructing or implementing this to your own database structure. The default provider is called AspNetAccessProvider in which an Access database is added to the App_Data folder in your web project and automatically configured for use. If Access proves not to be sufficient for your project, there are alternatives you can use. The first alternative is to use SQL Server instead of Access for profile storage, or for advanced developers, you can customize your own provider. For the examples and purposes in this book, we use the default provider.
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Accessing User Profiles in Code
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Now that you have defined the profiles for use, the last step is to show how you can access these profiles and set values for them. For example, let s take a look at the following section of code that will extract the value of the user s favorite background color and set that for an object placed on the web page. Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Panel1.BackColor = Profile.FavoriteBackgroundColor End Sub
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In this example, you have a panel control placed on the web page and you set the BackColor property to that color stored within the user profile. Perhaps the user can select from a drop-down list of colors. Upon making a selection, the value selected is stored within the user profile. This particular profile has a type of System.Drawing.Color, which is the same type as the BackColor property of the panel. All profiles can be accessed in the same manner. The profile class within the .NET Framework will access what was set within the web.config and allow you easily to extract that value from the provider that was specified with little coding required.
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Themes
Themes provide a visual experience and layout for the end user. Usually they refer to different colors or styles being applied to the web page. Within the web page, it could be changing the overall color or layout of the controls on the page. This is accomplished by providing different style sheets and possibly even skin files. To begin our discussion, first let s examine an example that many of you have probably come across, the very popular MSN website (http://www.msn.com). At the top of this site are two choices presented to users for setting the color or theme of the entire site. The choices are Simple White and Classic Blue. Take a look at Figures 9-7 and 9-8 to see each choice applied.
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