you can go thru this
http://www.c-sharpcorner.com/UploadF...eExtender.aspx with an update panel and thn later on you can follow below two steps.
1. have below jscript in your head of the page where your AutoCompleteExtender is placed
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<script type="text/javascript">
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function Test(sender,e)
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{
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__doPostBack("UpdatePanel1",sender._element.value) ;
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}
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</script>
2. Have something like this in your page_load
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private void Page_Load(object sender, System.EventArgs e)
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{
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Page.RegisterHiddenField("__EVENTTARGET", "btn");
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TextBox1.Attributes.Add("onkeypress", "return controlEnter('" + btn.ClientID + "', event)");
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//btn.Focus();
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TextBox1.Attributes.Add("autocomplete", "off");
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if (IsPostBack)
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{
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if (Request.Form["__EVENTTARGET"] != null &&
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Request.Form["__EVENTTARGET"] == "UpdatePanel1" &&
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Request.Form["__EVENTARGUMENT"] != null)
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{
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abc = Request.Form["__EVENTARGUMENT"];
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//this is the selected value - what you have selected in dropdown of AutocompleteExtender and later on you can run the query into database based on this value..in my case it was name and i fatched id thru name
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}
I hope it will help you..
