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AutoEventWireup=”true” 시 When the page posts back, the Page_Load method is called. Then, once the server actually processes the page and sends you a new one based on changes, the Page_Load is called again, actually the first time on the new page sent to you.

So if you are pulling data in the Page_Load event […]

foreach (ListItem listItem in txtQueueSID.Items) { listItem.Selected = listItem.Value.Contains("NFF"); }