Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The s

       Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500

在 ScriptManager  内添加 EnablePartialRendering="false" 显示详细的错误信息。

如下：
EnablePartialRendering="false"/>

一般的原因都是页面存在潜在的危险字符  在 页首加入 ValidateRequest="false" 

如下：

<%@ Page Language="C#" MasterPageFile="~/MasterPages/CompanyManage.master" AutoEventWireup="true" CodeFile="CompanyIntroEdit.aspx.cs" Inherits="CompanyIntroEdit" Title="Untitled Page" ValidateRequest="false" %>