c# print barcode zebra printer Figure 12-9 The ObjectList control when bound to the Customers table. in VS .NET

Creator Quick Response Code in VS .NET Figure 12-9 The ObjectList control when bound to the Customers table.

Figure 12-9 The ObjectList control when bound to the Customers table.
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In Figure 12-9, notice that a list of CustomerID values are initially displayed, but selecting BERGS brings up a new screen that shows the details for BERGS . On the cell phone, the ContactTitle is not visible, but is displayed by pressing the down arrow.
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Calendar Control
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The Calendar control allows the user to specify a date. The presentation of the date selection may be very different, depending on the type of device, as shown earlier in the adaptive rendering topic (see Figure 12-4). The Calendar control renders as a series of forms, in which the user can drill down to a specific date. The user also has the ability to manually enter a date.
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AdRotator Control
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The AdRotator control can be used to place an advertisement on a device. This control is similar to ASP.NET s AdRotator control, except that the rendering adapts to the device.
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Creating ASP.NET Mobile Web Applications
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The AdRotator can be assigned a series of images. The AdRotator control does not require a specific image type. The image can be assigned, based on the device type, by assigning device filters. The AdRotator control requires an .xml file to configure the advertisements. This file can be the same file that is used by the standard AdRotator Web server control, in which the root element of the .xml file is called Advertisements, and the Advertisements element may contain many Ad elements. Each Ad element contains elements for each advertisement property, as follows:
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Advertisements.xml
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< xml version="1.0" encoding="utf-8" >
<Advertisements xmlns="http://schemas.microsoft.com/AspNet/AdRotator-Advertisement-File
1.2">
<Ad xmlns="">
<ImageUrl>~/images/AdventureWorks.gif</ImageUrl>
<MobileImageUrl>~/images/AdventureWorksMobile.gif</MobileImageUrl>
<NavigateUrl>http://www.adventure-works.com</NavigateUrl>
<AlternateText>Ad for Adventure Works Web site</AlternateText>
<Impressions>100</Impressions>
<Keyword>AdventureWorks</Keyword>
</Ad>
<Ad xmlns="">
<ImageUrl>~/images/Contoso.gif</ImageUrl>
<MobileImageUrl>~/images/ContosoMobile.gif</MobileImageUrl>
<NavigateUrl>http://www.contoso.com/</NavigateUrl>
<AlternateText>Ad for Contoso Ltd. Web site</AlternateText>
<Impressions>200</Impressions>
<Keyword>Contoso</Keyword>
</Ad>
<Ad xmlns="">
<ImageUrl>~/images/NorthwindTraders.gif</ImageUrl>
<MobileImageUrl>~/images/NorthwindTradersMobile.gif</MobileImageUrl>
<NavigateUrl>http://www.northwindtraders.com</NavigateUrl>
<AlternateText>Ad for Northwind Traders Web site</AlternateText>
<Impressions>300</Impressions>
<Keyword>Northwind</Keyword>
</Ad>
</Advertisements>
Figure 12-10 shows the AdRotator control on the cell phone and in Internet Explorer. Notice that the Advertisements.xml file has a user-defined element called MobileImageUrl and that smaller images were created for mobile devices. The IsMo bile device filter is added to the AdRotator and the PropertyOverrides for the IsMobile device filter sets the ImageKey to MobileImageUrl.
Lesson 1: Building Mobile Applications
Figure 12-10 The AdRotator control rendering on the cell phone and on Internet Explorer.
PhoneCall Control
The PhoneCall control provides a simple method of dialing a phone number on devices that support placing calls. The PhoneCall control has a PhoneNumber property that can be set to the phone number that is to be dialed. The phone number is dis played on the device as a hyperlink, but if the Text property is set, the Text is displayed as a hyperlink instead. The SoftKeyLabel property can be set to a custom string, such as Call for the function key, if the device supports function keys. The PhoneCall control displays the contents of the AlternateText property if the device does not support phone calls. The AlternateText property defaults to {0} {1}, where {0} is the Text property and {1} is the PhoneNumber property.
Validation Controls
Validation controls are a very important part of standard ASP.NET 2.0 Web pages, and they are included as mobile controls as well. The following is a list of mobile valida tion controls:
RequiredFieldValidator
An entry is required in this field.
12
Creating ASP.NET Mobile Web Applications
RangeValidator The entry must be within the specified range. CompareValidator
The entry is compared to another value. The entry must match the specified pattern.
CustomValidator A custom validation function validates the entry. RegularExpressionValidator ValidationSummary
This displays a summary of all input errors.
These controls are essentially the same as the controls that are available in ASP.NET 2.0, except that the mobile validator controls do not provide client-side validation. You can combine these controls as necessary. For example, a TextBox may have both the RequiredFieldValidator and the RegularExpressionValidator.
Data Binding
Data binding in ASP.NET 2.0 is essentially the same as data binding in ASP.NET. Most controls support the DataSource and DataMember properties, while some controls support the DataTextField and the DataValue fields as well. It is important to use the IsPostBack property and load data into the cache. Rather than binding all controls, only the controls for the current form should be bound.
Applying Best Practices to Mobile Applications
In many respects, writing applications for mobile use can become a challenging endeavor. The following list identifies some guidelines and best practices that you should consider.
Provide a Separate Desktop Presentation
Although many devices are adaptive, desktop users want and expect a much richer presentation. It s usually best to provide two presentations: one for the desktop and one for the mobile devices. Keep page content as simple as possible.
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