What are the asp:DropDownList client side events?
Are you talking about ASP app? This app produces HTML code so you have all HTML events available, which for the select tag (select is a HTML tag for dropdown lists) are the following:
onchangeonclickondblclickonmousedownonmouseuponmouseoveronmousemoveonmouseoutonkeypressonkeydownonkeyuponfocusonblur
You can assign the onchange client-side event to a DropDownList control programmatically:
DropDownListID.Attributes["onchange"] = "javaScriptFunction();";Give a look to this article: