u必须为此使用AJAX dll
看到这个
http://msdn.microsoft.com/en-us/library/aa479042.aspx [ ^ ]

u have to use AJAX dll for that
see this
http://msdn.microsoft.com/en-us/library/aa479042.aspx[^]

我相信以下链接可以帮助您解决第一个问题

http://msdn.microsoft.com/en-us/library/ms178208.aspx [ ^ ]

这使用了客户端回调功能(可从ASP.NET 2.0获得)

I belive the following link can help you to resolve the first one

http://msdn.microsoft.com/en-us/library/ms178208.aspx[^]

This uses client call back feature (This is available from ASP.NET 2.0)

我需要从我的asp.net Web应用程序中的javascript调用ac#函数. /i>

是的你可以.试试:
1. XMLHttpRequest
2. PageMethods
3.回调

选择一个适合您的实施.

i need to invoke a c# function from javascript in my asp.net web application is it possible

Yes, you can. Try:
1. XMLHttpRequest
2. PageMethods
3. Callback

Pick the one that suits you and implement it.