为什么我的服务器代码ajax调用返回用双引号括起来的响应？

I am doing an ajax call from my javascript to an aspx page's webmethod. The string I'm returning is wrapped in double-quotes for some reason. I tried stripping them out, but the replace only replaced the first one for some reason. There are no quotes wrapping the string on the server-side. I am doing an ajax call from my javascript to a