VB.NET: Change Dropdownlist DataSource on web form on the fly

I have a dropdownlist on a web form that is already populated with values. In certain situations I want to do the following:

1. Erase the list in the dropdownlist (I'm done with it, don't need it anymore)
2. Plug in a single DataValueField and DataTextField (using values from string variables)
3. Make the plugged Text/Value appear in the dropdownlist
4. Select it.

How do I do it in VB.NET?
rgrimmAsked:
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jackiechen858Connect With a Mentor Commented:

if you want it in server side:

2.  
        ddl.Items.Add(New ListItem("text", "value"))
        ddl.Items.Insert(the index you want , New ListItem("text", "value"))
3. if you do 2, it will appear in the dropdownlist.

4.         ddl.SelectedIndex = the item's index;
if you use Add, the index should be ddl.Items.Count -1.


if you want in client side:

      <script lang="JavaScript">
      <!--
            function addItem( )
            {
                                       len=document.all.ddl.options.length;
                                       document.all.ddl.options[len] =new Option("text", "value", false, false);
                                       document.all.ddl.selectedIndex=len;
            }
            
      //-->
      </script>



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