data matrix barcode c# Figure 6-8 shows the test page for the RequiredTextBox control before any text has been entered. in C#.NET

Print Data Matrix 2d barcode in C#.NET Figure 6-8 shows the test page for the RequiredTextBox control before any text has been entered.

Figure 6-8 shows the test page for the RequiredTextBox control before any text has been entered.
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Figure 6-8 : The test page for the RequiredTextBox custom control
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Figure 6-9 shows the test page after it has been submitted, with the validator fired, displaying an asterisk (*).
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Figure 6-9 : The test page for RequiredTextBox after the page is submitted with a blank field The validation that has taken place in Figure 6-9 is on the client. Add a ClientTarget=Downlevel attribute/value pair to the @ Page directive and each click of the submit button will require a round-trip to the server. Note There are a couple of other ways to disable client-side validation (without dumbing down the rendering of the entire page). First, you can set the Click event of a submit button to Page_ValidationActive=false;. This technique is useful if, for example, you provide a cancel button on a form and want to allow the form to be cancelled without firing the client -side validation. Another, perhaps better, alternative is to set the CausesValidation attribute of an <asp:Button> to false. This will disable both clientside and server-side validation, something that you d likely want to do on a cancel button. Enhancing Design-Time Support Referring back to Figure 6-7, notice the selected control, which reads RequiredTextBox Designer . By default, a control in design mode will show just what would be displayed by a call to RenderControl. If this call would result in nothing being displayed, Visual Studio .NET will instead display the type and ID of the control, something like RequiredTextBox:RequiredTextBox1 . If you want to create your own display in the designer, you do have a few alternatives. The usual way to display the text is to use the Designer attribute for the class. In Listing 6-8, the Designer attribute is specified as follows: Designer("MyControls.RequiredTextBoxDesigner, RequiredTextBox") The Designer attribute tells the design-time environment that MyControls. RequiredTextBoxDesigner is the class that will serve as the designer and that it s in the RequiredTextBox assembly. In some examples, I ve seen the .dll extension explicitly specified to identify the assembly, but this extension isn t required, and for consistency with other parts of ASP.NET such as the @ Register directive, I ve omitted it here. The designer class is often in a subsidiary namespace for example, something like MyControls.Design. The designer class can be in any namespace and in any assembly. Placing the designer in the same assembly as the component is more convenient and imposes additional size in the assembly, even if the control will never be used in design mode. No runtime performance penalty is incurred, however, for having the designer in the same assembly. The RequiredTextBoxDesigner class, at the bottom of Listing 6-8, derives from the ControlDesigner class. A designer must derive from one of the following three classes: System.Web.UI.Design.ControlDesigner A general-purpose designer that derives from Control and WebControl. System.Web.UI.Design.WebControls.TemplatedControlDesigner Adds support for template editing. I ll provide more information about templated controls in 9.
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System.Web.UI.Design.WebControls.ReadWriteControlDesigner Adds support for in-place editing, as in the Panel control. This support allows you to place other controls on top of a control in design time. The RequiredTextBoxDesigner parameterless constructor is provided so that the class can be created without requiring any parameters. The bulk of the work of the designer is done in the GetDesignTimeHtml method. The method first gets an instance of the control. This instance can be used for retrieving or setting parameters. In this case, it s just there to show how you would obtain the current instance of the class. A StringWriter and an HtmlTextWriter are created (from the System.IO namespace). A new HyperLink object is created, and the placeholder link is rendered. The text of the hyperlink object is set to RequiredTextBox Designer , but it could be any arbitrary HTML code. Another option, which will result in the design-time appearance of a gray raised box similar to a button, is to use the CreatePlaceHolderDesignTimeHtml method, passing in a string parameter that will then be rendered on the gray box. Looking back again at Figure 6-7, two things about the Properties window are worth noting. First, the items in the Properties window are displayed in categories, and so the parameters I declared through the use of attributes as part of the Validator category are displayed together. Just as important, the ValidatorColor property is not just a text box in which you would enter names or numbers for colors but is instead a complete color picker, as shown in Figure 6-10.
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Figure 6-10 : The color picker, made available to our RequiredTextBox custom control The same behavior will occur with any type that has a complex property picker. Declare a property of the correct type, and the enhanced property picker becomes available with no additional programming required.
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