The entire control is contained in ASCX and files that are named Web User Control.
If you look at the markup of the control, you will see that it makes use of an Update Panel control that contains a Link Button control (the 'Update Indicators' button) and two hidden fields: When the button is clicked, the update panel initiates a partial postback to the server, where the code for the lnk Update Values_Click() event handler will run.
However, its server-side processing model has several drawbacks inherent in the technology, many of which can be addressed by the new features included in the Microsoft ASP. These extensions enable many new rich client features, including partial rendering of pages without requiring a full page refresh, the ability to access Web Services via client script (including the ASP. This whitepaper also assumes that you will be working with Visual Studio 2008, not Visual Web Developer Express, and will provide walkthroughs according to the user interface of Visual Studio (although code listings will be entirely compatible regardless of development environment).
User control not updating on postback
However, if the parent Update Panel is refreshed, then the child Update Panel will also be refreshed.
When working in the markup editor in Visual Studio, you may notice (from Intelli Sense) that there are two child elements of an , and can specify any Control within the current unit of encapsulation (for instance, if your Update Panel control resides within a Web User Control, you should not attempt to reference a Control on the Page on which the User Control will reside).
In Control, I have created a small form with text boxes and a button Control.
under this button click event, I want to change the text property of label like: lbl Confirmation.
Create a separate class library "Update Panel Lib" in the project (or grab it from the attached source code). The control class "Foo Panel" extends a Place Holder control.
The Helper class "Foo Event Helper" contains helper methods to raise custom events and to search for a specific control on the page. You can also put an control to display details for a selected employee. In a simple scenario, you can put user controls inside an update panel and they will be refreshed when the contents of the update panel are updated. The script needs to be dynamically injected the first time the control is rendered on the page it will live on.To achieve this, we use the Page_Load event handler for the control with the following code: This code is the interesting part: the first line, where we call the Script Manager.I added three custom events, "Foo Event One", "Foo Event Two" and "Foo Event Three".