The use of JavaScript developers is a major cause of hair to avoid the process of bringing back the page to refresh. For example we can use according to the Treeview control necessary to expand and collapse the corresponding data node. When you expand a node, the Treeview control server will use JavaScript to read information on the child nodes, then no smooth set to insert the new node. If you are not using JavaScript, then, Treeview control will return because the page and rebuild hair. Users will find that not only refresh the page because of the delay brought about, but the page is very likely reply to the original status, namely, the loss of those who started in front of the sub-node information. For server-side, the hair back every time because the process must deal with many view status (View State) information, which will seriously affect the performance of the overall implementation process. In ASP.NET 2.0, the introduction of a group called the "Client Callback" feature, use

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