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copied!<p>Sounds more like an architectural challenge to me.</p> <p>I recommend using a <a href="http://msdn.microsoft.com/en-us/library/7977ey2c.aspx" rel="nofollow">Queue</a>. This is a collection type following a <a href="http://en.wikipedia.org/wiki/FIFO" rel="nofollow">first-in, first-out</a> (FIFO) approach. You put objects into the queue and get them back out <strong>in the same order</strong>. An object that was received out of this queue is automatically is removed from the queue, so you can be sure that you do not handle the same element twice.</p> <p>Your described workflow then would work as these simple steps:</p> <ol> <li>Whenever a message arrives, you put the object <a href="http://msdn.microsoft.com/en-us/library/t249c2y7.aspx" rel="nofollow">into your queue</a>.</li> <li>When the admin clicks on the <code>next button</code>, you request the first object <a href="http://msdn.microsoft.com/en-us/library/1c8bzx97.aspx" rel="nofollow">out of the queue</a>.</li> <li>Your admin does his administrative tasks and approves the message.</li> <li>Clicking on <code>Next</code> start with above item 1 again.</li> </ol> <p><strong>[EDIT]</strong></p> <p>Oops, I realized that my <code>Queue</code> approach would not allow for navigating back to previous items.</p> <p>In this case I suggest using a simple <code>List</code> collection. This list can be accessed via the 0-based position in the list. This makes it easy to implement a forward/ backward navigation.</p> <p>For my sample code, please bear in mind that there is a lot that I cannot know about your environment, so my code make a lot assumptions here.</p> <p>You need to somwhere store a collection that contains your messages to be approved:</p> <pre><code>private IList<videomessage> _messagesToApprove = new List<videomessage>(); </code></pre> <p>You will also need some variable that keeps track of the current position in your collection:</p> <pre><code>// Store the index of the current message // Initial value depends on your environment. :-) private int _currentIndex = 0; </code></pre> <p>To begin with, you will need a starting point where new messages are added to that collection, like subscribing to some event or so. Whenever a message arrives, add it to the collection by calling a method like:</p> <pre><code>// I made this method up because I do not know where your messages really come from. // => ADJUST TO YOUR NEEDS. private void onNewMessageArriving(string messageId) { videomessage arrivingMessage = new videomessage(messageId); _messagesToApprove.Add(arrivingMessage); } </code></pre> <p>The you can easily implement the navigation by incrementing/ decrementing the position index:</p> <pre><code>private void previous_Click(object sender, EventArgs e) { // Check that we do not go back further than the beginning of the list if ((_currentIndex - 1) >= 0) { _currentIndex--; this.currentMessage = this._messagesToApprove[_currentIndex]; } else { // Do nothing if the position would be invalid return; } } private void next_Click(object sender, EventArgs e) { // Check if we have new messages to approve in our list. if ((_currentIndex + 1) < _messagesToApprove.Count) { _currentIndex++; currentMessage = _messagesToApprove[_currentIndex]; } else { // Do nothing if the position would be invalid return; } } private void approve_Click(object sender, EventArgs e) { // Sorry, I don't know where exactly this comes from, needs to be adjusted to your environment status.SelectedValue = "1"; this.currentMessage.status = "1"; this.currentMessage.Save(); // If you want to remove items that have been checked by the admin, delete it from the approval list. // Otherwise remove this line :-) this._messagesToApprove.RemoveAt(_currentIndex); } private void remove_Click(object sender, EventArgs e) { // Sorry, I don't know where exactly this comes from, needs to be adjusted to your environment status.SelectedValue = "2"; this.currentMessage.status = "2"; this.currentMessage.Save(); // If you want to remove items that have been checked by the admin, delete it from the approval list. // Otherwise remove this line :-) this._messagesToApprove.RemoveAt(_currentIndex); } </code></pre>

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