title: Excel import check Sheet password
body: <p>I'm using EPPlus to create excel file with some restriction (lock, validation,..) and I have set a password for the sheet:</p>
  
  <pre><code>sheet.Protection.IsProtected = true;
  sheet.Protection.SetPassword("pass");
  </code></pre>
  
  <p>Users have to make some changes in the file and import the same file. </p>
  
  <p>How can i check when importing file that the password is the same ("pass") 
  using EPPLUS? I want to be sure that user use and import the same Excel file. </p>