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2012-05-07T07:40:17.690
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2012-05-07T07:47:05.050
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2012-05-07T07:47:05.050
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<p>You could put the DropDownList inside an UpdatePanel and then subscribe to the <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.selectedindexchanged.aspx" rel="nofollow">SelectedIndexChanged</a> event after setting the <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.autopostback.aspx" rel="nofollow">AutoPostBack</a> property to <code>true</code>.</p> <p>Here's an example:</p> <pre><code><%@ Page Language="C#" %> <script type="text/C#" runat="server"> protected void OnChange(object sender, EventArgs e) { label.Text = string.Format("Selected value: {0}", ddl.SelectedValue); } </script> <!DOCTYPE html> <html> <head> <title></title> </head> <body> <form id="Form1" runat="server"> <asp:ScriptManager ID="scm" runat="server" /> <asp:UpdatePanel ID="up" runat="server"> <ContentTemplate> <asp:DropDownList ID="ddl" runat="server" AutoPostBack="true" OnSelectedIndexChanged="OnChange"> <asp:ListItem Value="1" Text="item 1" /> <asp:ListItem Value="2" Text="item 2" /> <asp:ListItem Value="3" Text="item 3" /> </asp:DropDownList> <asp:Label ID="label" runat="server" /> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="ddl" EventName="SelectedIndexChanged" /> </Triggers> </asp:UpdatePanel> </form> </body> </html> </code></pre> <p>To learn more about update panels and ASP.NET AJAX you may take a look at the <a href="http://www.asp.net/ajax/documentation/live/overview/UpdatePanelOverview.aspx" rel="nofollow">following article</a>.</p>
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1. POAjax Based DropDownList Event in asp.net
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1. USDarin Dimitrov
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1. USDarin Dimitrov
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1. POAjax Based DropDownList Event in asp.net
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1. COI am new to asp.net. Can you provide some useful links so that it will be easier to implement same.
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  USAbhishek
2. COI have posted an example. Also here's a link you may take a look at: http://www.asp.net/ajax/documentation/live/overview/UpdatePanelOverview.aspx
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