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<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Hello,Ajax!</title>
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</head>
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function ajax( url, param, method, response ){
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using System.IO;
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string filePath = @"D:\...\xxx.xxx";

if (File.Exists(filePath))
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}
else
{
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