title: MVC: How to know which input value from HttpPostedFileBase
body: <p>Let me try to explain my situation as simple as possible first:</p>
  
  <p>Suppose I have a page which contains multiple [input type='File']. Some of them may be selected a file and some are not.</p>
  
  <p>In my httppost method, I know I need to use parameter like "IEnumerable files"  to get filenames, and also each [input] name I should define either = 'files' or 'files[0]','files[1]', etc.....</p>
  
  <p>My question is: when getting a list of HttpPostedFileBase, how could I determine which file belongs to which input control？ As some inputs may leave blank.</p>
  
  <p>Also because these [input] are created dynamically and there is no fixed number of it, I could not hard-code the parameter in httppost method for each of them.</p>