Ajax getting started

<asp:UpdatePanel ID="UpdatePanel5" runat="server">
<asp:DropDownList ID="ddlSoftwareVersion" runat="server" Width="300"></asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ddlSoftwareVersion" ErrorMessage="Please select a software version" CssClass="red"></asp:RequiredFieldValidator>
<asp:AsyncPostBackTrigger ControlID="ddlCourse" EventName="SelectedIndexChanged" />


<asp:UpdateProgress ID="UpdateProgress5" AssociatedUpdatePanelID="UpdatePanel5" runat="server">
Update in progress...

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