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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>
ASP.NET2.0ÖÐAJAXʹÓÃеÄManager ÀàÀ´¹ÜÀí£¬¶ø²»¼æÈÝÔ­À´µÄ ClientManager Àà ,ËùÒÔÓÃresponse.write("<script>alert('Ìáʾ£ºµãÎÒÁË!')</script>")ºÍ
this.Client.RegisterClientBlock(this.GetType(), "name", "<>alert('Ìáʾ£ºµãÎÒÁË!');</>", true);
Page.Client.RegisterClientBlock(this.GetType(), "name", "<>alert('Ìáʾ£ºµãÎÒÁË!);</>", true);
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ScriptManager.RegisterStartupScript(UP, UP.GetType(), "", "alert('µãÎÒÁË');", true);
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//UPÊÇupdatepanel µÄID
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 protected void Page_Load(object sender, EventArgs e)
    {
        Thread.Sleep(500);
        string Keyid = Request.QueryString["Id"].ToString();
      ......

ajax XMLHttpRequest post get

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function getXmlHttpRequest() {
    var xmlHttpRequest = null;
    try {
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    } ......

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<script language="javascript" event="onclick" for="ImageButton1">
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</script> 
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using System.Collections.Generic;
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