解决：DropDownList的AutoPostBack=True不能触发SelectedIndexChanged事件
找找看，有没有button的id叫做类似submit的情况。如果有，请修改。
此处submit会与theform.submit();
冲突...
总结：以后提交按钮 我宁可 id=tijiao 也不会id=submit 啦。
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