c# - HttpPostedFileBase returns null after submitting -

i keep on getting null httpposterfilebase when try uploading file:

i have code in view:

@using (html.beginform("import", "control", formmethod.post, new { enctype = "multipart/form-data" })) {     <input type="file" name="fileupload"/>     <input type="submit" value="import" id="btnimport" class="button" /> } 

and code controller:

[httppost] public actionresult import() {          httppostedfilebase file = request.files[fileupload];                  other codes... } 

i tried in controller:

[httppost] public actionresult import(httppostedfilebase fileupload) {             other codes... } 

after pressing submit button "file" got value of null.

the default model binder binds name files. inputs name fileupload.. parameter name file. making them same work.