Only one asp.net page through out
<p>I have created a web page but i want to restrict only one instance of the page should be running at all times. The scenarios are given as below.</p>

<ol>
<li>First time - User launches the page by URL and page loads.</li>
<li>User types URL again in another window and it should say that a page is already open OR refresh the existing page.</li>
<li>User closes the window and tries again - new fresh page will be loaded.</li>
</ol>

<p>Additional Details : I have a database, user authentication.</p>

<p>Tried So Far : Set a flag in DB-->> This method how do i redirect the user back to the page which is already opened.</p>

<p>Any ideas to implement this.?</p>

<p>Thanks in Advance for your opinions and suggestions.</p>
