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Sys.WebForms.PageRequestManagerParserErrorException:The
message received from the server count not be parsed.Common causes for
this error are when the response is modified by calls to
response.Write(),response filters,HttpModules,or server trace is
enabled.
Details:Error parsing near '<script language=javascript'.
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<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <Triggers>
            <asp:PostBackTrigger ControlID="Button1" />
        </Triggers>
        <ContentTemplate>
            <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
        </ContentTemplate>
    </asp:UpdatePanel>
</div>
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