create a qr code using c# and asp.net Part V in C#.NET

Painting QR-Code in C#.NET Part V

Part V
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The Client Side
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The second step consists of associating each candidate region with a list of refresh conditions. You basically answer the question, When does this region get updated After you have compiled a list of candidate regions, and for each you have a list of refresh events, you re pretty much done. The final step is mapping this information to UpdatePanel controls and triggers. If all the regions you have identified are disjointed, you re fine. If not, you use properties and triggers on the UpdatePanel control to obtain the expected page behavior, thereby minimizing the impact of postbacks and page flickering. If needed, updatable panels can be nested. There s no syntax limitation to the levels of nesting allowed. Just consider that any nested panel refreshes when its parent is refreshed, regardless of the settings. Let s be honest. It might not be a trivial task, and getting a disjoint set of regions is not always possible. However, given the number of properties supported by the UpdatePanel control, there s always room for a good compromise between user experience and performance.
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Configuring for Conditional Refresh
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An UpdatePanel control refreshes its content under the following conditions:
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When another UpdatePanel control in the same page refreshes When any of the child controls originates a postback (for example, a button click or a change of selection in a drop-down list with AutoPostBack=true) When handling a postback event the page invokes the Update method on the UpdatePanel control When the UpdatePanel control is nested inside another UpdatePanel control and the parent update panel is updated When any of the trigger events for the UpdatePanel occur
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You can control these conditions through a number of properties such as UpdateMode and ChildrenAsTriggers, as well as the collection Triggers. To minimize the total number of postbacks and the amount of data being roundtripped, you should pay a lot of attention to the values you assign to these properties. Let s delve deeper into this topic.
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Detecting Postbacks from Child Controls
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By default, all updatable panels in a page are synchronized and refresh at the same time. To make each panel refresh independently from the others, you change the value of the UpdateMode property. The default value is Always, meaning that the panel s content is updated on every postback that originates from anywhere in the page, from inside and outside the updatable region.
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By changing the value of the UpdateMode property to Conditional, you instruct the updatable panel to update its content only if it is explicitly ordered to refresh. This includes calling the Update method, intercepting a postback from a child control, or handling any of the events declared as triggers. Normally, any control defined inside of an UpdatePanel control acts as an implicit trigger for the panel. You can stop all child controls from being triggers by setting the value of ChildrenAsTriggers to false. In this case, a button inside an updatable panel, if clicked, originates a regular full postback. What if you want only a few controls within an UpdatePanel to act as triggers You can define them as triggers of a particular UpdatePanel, or you can use the RegisterAsyncPostBackControl method on the ScriptManager class. The RegisterAsyncPostBackControl method enables you to register controls to perform an asynchronous postback instead of a synchronous postback, which would update the entire page. Here is an example of the RegisterAsyncPostBackControl method:
protected void Page_Load(Object sender, EventArgs e) { ScriptManager1.RegisterAsyncPostBackControl(Button1); }
The control object you pass as an argument will be a control not included in any updatable panels and not listed as a trigger. The effects of the postback that originates from the control differ with regard to the number of UpdatePanel controls in the page. If there s only one UpdatePanel in the page, the script manager can easily figure out which one to update. The following code shows a page whose overall behavior might change if one or two UpdatePanel controls are used:
protected void Button1_Click(Object sender, EventArgs e) { // If there s only one UpdatePanel in the page, and it includes this Label control, // the panel is refreshed automatically. Label1.Text = "Last update at: " + DateTime.Now.ToLongTimeString(); // This Label control, not included in any UpdatePanel, doesn t have its UI // refreshed. Its state, though, is correctly updated. Label2.Text = "Last update at: " + DateTime.Now.ToLongTimeString(); }
When multiple panels exist, to trigger the update you have to explicitly invoke the Update method on the panel you want to refresh:
protected void Button1_Click(object sender, EventArgs e) { Label1.Text = "Last update at: " + DateTime.Now.ToLongTimeString(); UpdatePanel1.Update(); }
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