解决方案是我创建了新项目，并将代码合并到新项目和Bingo中.

但是我找不到第一个项目的行为的原因.

但是无论如何，我的项目已经开始处理回发.

The solution was I created the new project and merged the code in new project & bingo It worked.

But I couldn''t findout the reason for that behaviour of first project.

But anyway my project has started handling the post-backs.