DropDownList

// Get the value of the selected item
$("#ComboBox").val()
 
// Get the text of the selected item
$("#ComboBox option:selected").text()
 
// Find out when the select value changed
$("#ComboBox").change(function() { /* do something here */ });
 
// Programmatically set the selected item
$("#ComboBox").val(2);
 
// Clear the list
$("#ComboBox").html("");
 
// Add to the list: 
$("<option value=’9’>Value 9</option>").appendTo("#ComboBox");
 
// Select All options
$('fieldset select option').attr('selected','selected');