title: How to set selected value as empty for dropdownlist via jquery
body: <p>I am using jquery to populate dropdownlist, the codes are like below:</p>
  
  <pre><code> var myOptions = {  
     val1 : 'text1',   
     val2 : 'text2',
     val3 : '' 
      };
   $.each(myOptions, function(val, text) {  
     $('#mySelect').append( $('&lt;option&gt;&lt;/option&gt;').val(val).html(text)    
  );
  
   });
  </code></pre>
  
  <p>now I have populate 3 items in my dropdown, and now I want to set my dropdownlist selected value with '', just like:</p>
  
  <pre><code>$("#mySelect option contain('')").attr(selected,true).
  </code></pre>
  
  <p>Actually, this will get all 3 items so that it will not set '' as selected value, is there any way that i can do this?</p>