How to ensure that if dropdown selection is first item nothing happens
<p>I have the code below to open a pop up when user makes a selection. What I would like is to block when user selects the first item in the drop down as it has no real value. Also, I want to allow user to reselect already selected option by clicking the dropdownlist option again. </p>

<pre><code>function OnClientSelectedIndexChanged(sender, eventArgs) {
           var inputFieldValue;
           var item = eventArgs.get_item();
           grid = $find("&lt;%= rggrid.ClientID %&gt;");

           var selectedRows = grid.get_selectedItems();
           if (selectedRows.length &gt; 0) {
               for (var i = 0; i &lt; selectedRows.length; i++) {
                   var row = selectedRows[i];
                   inputField = MasterTable.getCellByColumnUniqueName(row, "Item")
                   if (inputField) {
                       inputFieldValue = inputField.value
                       break;
                   }
               }
           }
           else {
               var inputFieldID = window['textItembox'];
               inputField = document.getElementById(inputFieldID);
               if (inputField) {
                    inputFieldValue = inputField.value;
                   }
           }
           window.radopen('&lt;%=linker %&gt; , "UserDialog");
           return false;
       }
</code></pre>
