What do you mean by "editable DropDownList"?
How is the user going to be able to edit it?
It sounds like you're going to want to create/develop/implement a user control that is based on a DropDownList that allows the user to edit the contents of the DropDownList.
u can use textbox and dropdown list to make editable dropdown list
[code=asp]
<asp:DropDownLi st ID="dropdown" runat="server" Font-Bold="True" Style="z-index: 100;
whn user click on new item show textbox and hide drop down and when he write new item in textbox then add tht item in drop down and make it visible
[code=cpp]
protected void dropdown_Select edIndexChanged( object sender, EventArgs e)
{
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