storageFile.CopyAsync break being used by another process

Hi I use the

 var copiedStorageFile = await storageFile.CopyAsync(ApplicationData.Current.TemporaryFolder, storageFile.Name, NameCollisionOption.ReplaceExisting);

to copy the image for cropping process
when I use it again I tell me that the folder is being used by other process
Is there a way to force all process close when I do this ?