c# - the process cannot access the file, it is still being used error -

there lot of answers on question on stackoverflow itself. didn't understand happening.

i tried upload file, file may in count also.

below part of code creating problem-

 public actionresult upload(list<httppostedfilebase> file, cardmodel card) {             foreach (var item in file) {                 cardtable cardtable = new cardtable();                if (item != null && item.contentlength > 0) {                     string extension = path.getextension(item.filename);                     if (imageextension(extension)) {                         string path = server.mappath("~/cardphotos/");                         item.saveas(path + item.filename);                         string filename = item.filename; 

while saving file item.saveas(path+item.filename); shows me error "the process cannot access file, being used process.

an alternate solution using sleep first want understand exception , want know obvious solution.

you can dispose file after saving/creating, this.

item.saveas(path + item.filename); item.dispose(); 

alternatively, can put save in using block, similar below.

using(var = new httppostedfilebase(item)) {     i.save(path + item.filename); } 

another reason think of, new upload file trying overwrite existing file, , existing file opened on server.