write some javascript to do it:string scriptString = "<script language='javascript'>document.all('DropDownList1').selectedIndex = -1;</" + "script>";
RegisterStartupScript("Startup", scriptString);
RegisterStartupScript("Startup", scriptString);
'.......
DropDownList1.DataBind()
dim scriptString as string = "<script language='javascript'>document.all('DropDownList1').selectedIndex = -1;</" + "script>"
RegisterStartupScript("Startup", scriptString)
end if
你可以在绑定后在第一行插入个“请选择”的字样。
我就是用这个方法。