opening a file using FileStream in C#

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C#

hi i am using pdf file where i am submitting the form to the function in the controller so where i am getting contenttype and content length in the function using request object.

in the same passion i am getting the url of the file where it is saved by using Request.UrlReferrer.PathAndQuery into string variable so when i run the application it is giving differenttype of errors like
-->could not find a prt of the file
-->can not be accessible
-->it is opened already

the target file is storing as system temporary file in temp folder

can any one tell me the solution