free code 128 font crystal reports

crystal reports code 128 font

crystal reports pdf 417, crystal report barcode formula, free code 128 barcode font for crystal reports, crystal reports upc-a, crystal reports 2d barcode, crystal reports barcode font, native barcode generator for crystal reports crack, code 39 font crystal reports, barcode crystal reports, how to use code 39 barcode font in crystal reports, crystal reports barcode formula, crystal reports upc-a barcode, crystal report barcode ean 13, crystal reports gs1 128, embed barcode in crystal report

Figure 5-7. Retrieving custom configuration data Custom section handlers can get a fair bit more sophisticated. For example, you might want to create a section that has nested subelements. Here s an example of a more complex <orderService> section that uses this design: <orderService available="true" pollTimeout="00:01:00"> <location computer="OrderComputer" port="8010" endpoint="OrderService" /> </orderService> To work with this structure, you simply need to create a class that derives from ConfigurationElement to represent each nested element. Here s the class you need to represent the <location> element: public class Location : ConfigurationElement { [ConfigurationProperty("computer", IsRequired = true)] public string Computer { get { return (string)base["computer"]; } set { base["computer"] = value; } } [ConfigurationProperty("port", IsRequired = true)] public int Port { get { return (int)base["port"]; } set { base["port"] = value; } } [ConfigurationProperty("endpoint", IsRequired = true)] public string Endpoint { get { return (string)base["endpoint"]; } set { base["endpoint"] = value; } } }

To improve the transmission times of your page, it s a good idea to eliminate view state when it s not needed. Although you can disable view state at the application and page level, it makes most sense to disable it on a per-control basis. You won t need view state for a control in three instances: The control never changes. For example, a button with static text doesn t need view state. The control is repopulated in every postback. For example, if you have a label that shows the current time, and you set the current time in the Page.Load event handler, it doesn t need view state. The control is an input control, and it changes only because of user actions. After each postback, ASP.NET will populate your input controls using the submitted form values. This means the text in a text box or the selection in a list box won t be lost, even if you don t use view state.

Figure 9-6. Binding a list control to a data source field 4. You can use the same steps to bind a rich data control. Add a GridView to your page, and set the GridView.DataSourceID property to the same data source. You don t need to set any field information, because the GridView can display multiple fields. You ll see the column headings from your query appear on the design surface of your page immediately. 5. Run your page. Don t worry about executing the command or calling DataBind() on the page ASP.NET performs both of those tasks automatically. You ll see a data-bound page like the one in Figure 9-7. Clearly, the great advantage of the data source controls is that they allow you to configure data binding at design time, without writing tedious code. Even better, the results of your selections appear (to a limited degree) in the Visual Studio designer so you can get a better idea of what your form will look like.

And here s the revised Location property in the OrderService class: [ConfigurationProperty("location", IsRequired = true)] public Location Location { get { return (Location)base["location"]; } set { base["location"] = value; } } Now you can write code like this: lblInfo.Text = "<b>Server:</b> " + custSection.Location.Computer Using the techniques in this chapter, you can save changes to a custom configuration section, and you can encrypt it. You can also use additional attributes to validate configuration string values (look for the attributes that derive from ConfigurationValidatorAttribute), and you can create sections with nested elements and more complex structures. For more information about extending ASP .NET configuration files, refer to the MSDN Help.

Remember that view state applies to all the values that change, not just the text displayed in the control. Tip For example, if you dynamically change the colors used in a label, you ll need to use view state even if you don t dynamically set the text. Technically, it s the control s responsibility to use view state, so it is possible to create a server control that doesn t retain certain values even if view state is enabled. This might be used to optimize performance in certain scenarios.