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<form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
    <asp:updatepanel ID="UP" runat="server">
      <ContentTemplate>
        <asp:Button runat="server" Text="Button" onclick="Unnamed2_Click" />
      </ContentTemplate>
   </asp:updatepanel>
    </div>
</form>
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this.Client.RegisterClientBlock(this.GetType(), "name", "<>alert('Ìáʾ£ºµãÎÒÁË!');</>", true);
Page.Client.RegisterClientBlock(this.GetType(), "name", "<>alert('Ìáʾ£ºµãÎÒÁË!);</>", true);
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function getXmlHttpRequest() {
    var xmlHttpRequest = null;
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