c# pop up div link button is not clicked

how to work c# pop up div link button is not clicked:

In this post we make a popup div and try to use it in coding .

<div class="fixed-popup popup-square popup-connections dismissable" 

id="popup-remove-connection" style="display: block;">
  <div class="popup-inner">
    <div class="close">X</div>
    <h3>Are you sure you'd like to remove this connection?</h3>
    <div class="button-bar">
      <a class="btn-close button button-link" href="#">Cancel</a>
      <a class="btn-approve button" href="#">Yes, I'm Sure</a>
    </div>
  </div>
</div>

This pop up div shows when i click a button than i am 
trying to click on "Yes, I'm Sure" using this code :

 Link linkApprovebtn = browser.Link(Find.ByText("Yes, I'm Sure"));
   if (linkApprovebtn.Exists)
                  {
                    linkApprovebtn.Click();
                      browser.WaitForComplete();
                        }
the code execute the click but nothing happend on the

 i have also tried this code:

   AlertDialogHandler AlertDialog = new AlertDialogHandler();
                                        try
                                        {
            
            Settings.AutoStartDialogWatcher = true;
             Settings.AutoCloseDialogs = true;

            browser.AddDialogHandler(AlertDialog);

             AlertDialog.WaitUntilExists();

             
              if (AlertDialog.Exists())
                {

               
                 AlertDialog.OKButton.Click();
                  browser.WaitForComplete();
                   browser.RemoveDialogHandler(AlertDialog);

                                            }
                                        }