why page redirects with an aberrant behaviour

Question

i am facing a weird problem which for long i am unable to sort out the issue is i am having a aspx page located in ../admin/createstudentsId but when i compile (ctr+f5) it redirects me to "http://localhost:1104/PlacementManager/login.aspx" and give error message

"The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.

Requested URL: /PlacementManager/login.aspx

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Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42 "

while i haven't set any session for this what may be the issue please let me know i am just stuck on this. while there is no page on the location like this "/PlacementManager/login.aspx" my aspx page is integrated with the master page