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Populate Treeview upon entered criteria and page action without complete page posting on client side

Posted By:      Posted Date: August 27, 2010    Points: 0   Category :ASP.Net

1. I have a treeview on left side in a panel in my aspx page and I have a Text box and a Search button on the right panel. On entering a search criteria and clicking the Search button, I want to get the data needed for the treeview (FYI - I have a webservice call for that) and then populate the treeview completely but keep it collapsed to the root node.

  Each time I enter the search criteria and click the Search button, I don't want to post the entire page (and also don't like the page flicker), how can I achieve this? I know that in order to avoid complete postback upon Search button click, I can do so by client callback and get the data needed for the treeview, but in this case, I have to build the treeview nodes as table - row/cells and handle all the events and handlers myself, which I want to avoid (also means that I won't be able to take advantage of the inherent expand and collapse capabilities of the Treeview). On the other hand, if I use the OnTreeNodePopulate event handling of the Treeview control, using the C# script code on the aspx markup, it doesn't recognize the entered criteria in the Text box. So either way,

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