The name "__o" does not exist in the current context of ASP. WebForm

Error CS0103 name "__o" does not exist in the current context

Recently engaged in a WebForm project, and then the page to write a point <%%> code, the results of the compilation actually appeared this error

Burst Ah, what is this yarn, it seems that IntelliSense has made a mistake,

The solution is to write an empty <%= ""%> in the location above the page <%=xxxx%> code

Compile again, haha, no bar ~ As to why, I am not very clear, we look at the article I search

Https://stackoverflow.com/questions/31886413/the-name-o-does-not-exist-in-the-current-context

The name "__o" does not exist in the current context of ASP. WebForm