The "&" character will destroy the data stored in the web The "&" character breaks passwords that are stored in the web config

problem ：

I have an ASP.NET MVC3 C# .NET Application running on IIS 7.5. I have one in IIS 7.5 Running on ASP.NET MVC3 C＃.NET Applications .

We have a Windows NT service account we Impersonate in our code in order to read/write documents to a file share. We simulated a in the code Windows NT Service account , To read the document / Write to file share .The user id is compiled in the code and the service account password is stored in the web.config file. user ID Compile... In code , The service account password is stored in web.config In file .

The password contains an ampersand character (ie: p&ssword ). Password contains ＆ Symbol （ namely ： p&ssword ）.

This broke the site. This breaks the website .When accessing the site we received this error :"Sorry, an error occurred while processing your request". When visiting the website , We received this error ：“ I'm sorry , An error occurred while processing your request ”.

Here is the code that uses the password: Here is the code to use the password ：

    var password = ConfigurationManager.AppSettings.Get(Common.SVC_PWD);    bool isSuccess = LogonUser(        @"my_svc_acct",        "my.domain.net",        password,        LOGON32_LOGON_NEW_CREDENTIALS,        LOGON32_PROVIDER_DEFAULT, ref token    );

Why would this cause the site to break? Why does it cause website disruption ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/zIBc