title: validating a excel file in a web application
body: <p>I've been tasked with allowing a user to upload an excel file and validating the data within the file. </p>
  
  <p>I've researched ways on how to validate the data before the user submits the excel file on the client side( in javascript ), but it looks like you can't do this. </p>
  
  <p>Is seems that the only way is to post this file to the server and do the validation on the server. </p>
  
  <p>This seems like it could be time intensive. As of right now we don't really know how big this files can be, so we really don't want to bog down our server. </p>
  
  <p>Is there any good way to do this?</p>
  
  <p>Also, I am not saving the excel file on the server I just care about the data in it. </p>
  
  <p>This is a ASP .NET application. </p>