title: calling C# function immediately file is selected in fileupload
body: <p>I have a web form(asp.net) which I'm using to upload file. In current situation if a user choose a text file from their computer they have to click a buttton to upload the text in a box. I'm trying to find a way to skip the step with a button pressing.</p>
  
  <p>How to call a C# function when the file is selected from user ?</p>