页面做完后，查看源代码，有个<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value=“”
input里的value的值是一段很长的字符串，这是什么，是正常吗？为什么会产生这么长的值？怎样能使他不产生呢？

/////////////////////////////////////////
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="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">

------解决方案--------------------
如果它确实很大（10K根本不算大！而你贴的远远小于10K），你可以写这个代码：

C# code

using System;
using System.IO;
using System.Linq;
using System.Runtime.Serialization.Formatters.Binary;
using