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<%@ Register TagPrefix="cb" TagName="Callback" Src="~/Callback.ascx" %>
<script type="text/javascript">
$(function () {
PerformCallback();
}
function OnCallback1Complete(ret) {}
function OnCallback1Error(ret) {
alert(ret);
}
<cb:Callback ID="Callback1" runat="server" ClientPerformCallback="PerformCallback" ClientCompleteEvent="OnCallback1Complete"
ClientErrorEvent="OnCallback1Error" OnCallback="Callback1_Callback" />
后台.cs文件
protected void Callback1_Callback(object source, Callback.CallbackEventArgs e)
{ e.Result =你要传递的结果}