Hi Alex,How do i set Default value "SELECT on dropdown  ,when my  DisplayMode="DropDownList" ,NullText="Select".I tried from code behind  ddlMultiTest.Items.Insert(0, new DropDownItem("Select", "NA")); but dropdown display select with checkbox.Please Help me

Angel,

The idea of the Microsoft asp:DropDownList that is mentioned makes sense.  However, that dropdown is not capable of multi-selection like the Infragistics WebDropDown is.  Once you turn on Multiselect on the ig:WebDropDown, it doesn't make sense to have DisplayMode set to DropDown.  Since each item can be rendered with a checkbox, we know that ALL items will be valid selections.  All you need to be able to do is check the checkbox, so there should be no typing in the WebDropDown at all.  For Multi-select with checkboxes, the only logical DisplayMode is DropDownList so there should be no reason to automatically select the first item in the list in this case.

wvusaf

Thank You !

Hi, The idea of DisplayMode = DropDownList is exactly that you will always have a valid selection, so whatever is in the input box (CurrentValue) matches with your items. That's how the Microsoft asp:DropDownList works by default. 

If you really want to have DisplayMode = DropDownList, and not have initial selection , then you will have to resort back to DisplayMode = DropDown, and cancel the ValueChanging client-side event, in case the entry doesn't match an item. 

Hope it helps. Thanks,

Angel