debug时弹出提示框：内容有：an operation is not legal in the current state
解决方案：
Go to Tools > Options > Debugging > General and turn off the setting for Enable JavaScript Debugging for ASP.NET (Chrome and IE).
vs问题解决：an operation is not legal in the current state
原文：http://www.cnblogs.com/dayang12525/p/7440358.html