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Access item value and OnValueChange event (final value change event)


I am using build number 9.1.2087. Here is my sample code:

<ig:WebDropDown ID="WebDropDown1" runat="server" DropDownAnimationType="Linear" TextField="Keyword_Description" ValueField="Keyword_Description" EnableAutoFiltering ="Server" DropDownContainerHeight="150px" DropDownContainerMaxHeight="0px" EnableAutoCompleteFirstMatch ="False" DropDownContainerWidth="200px" LoadingItemsMessageText="Loading" AutoPostBackFlags-SelectionChanged="On" EnableLoadOnDemand="True" Width="200px" EnableClosingDropDownOnSelect="true" EnableCustomValues="false" EnableDropDownAsChild="True" MultipleSelectionType="Checkbox" PageSize="20" EnableTheming="True" StyleSetName="Office2007Blue"> 


<table style="width: 100%; height:40px; background-color:#507DA6; color:White; font-size:20px; font-weight:bold;" cellspacing="0" cellpadding="4">


<td style="width: 100px;">Keyword #</td>
<td style="width: 250px;">Description</td>







<DropDownItemBinding TextField="Keyword_Description" ValueField="Keyword_Uniq" /> 




<table style="width: 100%;" cellspacing="0" cellpadding="4">
<tr style=" border-bottom:solid 1px #ff0000;">
<td style="width: 100px;border-bottom:solid 1px #E8E8E8;"><%#DataBinder.Eval(Container.DataItem, "Keyword_ID")%></td>



<td style="width: 250px;padding-left:10px;border-bottom:solid 1px #E8E8E8;"><%#DataBinder.Eval(Container.DataItem, "Keyword_Description")%></td>











 On a server side code I need to access Keyword_ID. How can I get access to all the columns in the drop down list?

Also, I need to do some logic only after the final value is selected or typed in. What event can I put my code in.


I tried WebDropDown1_SelectionChanged and WebDropDown1_ValueChanged but these fire everytime user types something in. I need to fire this event only after user clicks on the item or the full match is found and selected.

How can I do this?