variable is not declared it may be inaccessible due to its protection level

Question

My VB skills are not the best, and this problem has had me stumped for a few days.

In the list of controls shown in Visual Studio that are not defined in the code be

Answer 1

I got this error briefly after renaming the App_Code folder. Actually, I accidentally dragged the whole folder to the App_data folder. VS 2015 didn't complain it was difficult to spot what had gone wrong.