help me to get the path of a file from fileupload control

You can't, reliably. Security forbids this, as it would give information (albeit indirectly) about the client hardware.
You can't use it anyway - there is no way to reload it to the original location, as the client browser has control over where it goes, not you.
IE will return a path (sort of), FF will return only the name, and so on.

you have to mannualy remove last folder names from your path string.

the article describes the solution,

http://www.dotnetheaven.com/uploadfile/prathore/how-to-find-last-index-of-the-string-in-Asp-Net-using-C-Sharp/[^]

Are you trying to get local file name on the client or build a file name to store uploaded file on server?

The first is hard to achieve - actually, impossible in most cases. It is browser dependent.

As to the second: Server.MapPath() method maps virtual or relative path to a path on server. fileupload1.PostedFile.FileName contains the name of the loaded file.
According to the code, you are trying to map file name on the client (in most cases without path) to the path on server. And documentation on MapPath method[^] says that when relative path doesn't start with a slash, you'll receive a path "relative to the directory of the .asp file being processed" - i.e. your web form directory.

To resolve the problem you can store absolute path to your upload folder in custom settings or get web application root path and add fixed relative path. Besides, avoid using FilePath directly - see this link[^], for example

it's may be help you..
Application.StartupPath