vb.net detailsview change data before update

I have a detailview showing data from an MS SQL 2000 table.  It shows fldtaskname, fldstartdate, and fldclosedate.  In edit mode I have put a dropdown list with the values Yes and No.  If the user selects Yes I want to put todays date in the fldCloseDate, if they select No I want to leave the field unchanged.

How do I intercept the update and convert Yes to todays date, or convert No to null value?

<asp:TemplateField HeaderText="Close" SortExpression="fldCloseDate">
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem Selected="True">No</asp:ListItem>
<asp:Label ID="Label4" runat="server" Text='<%# Bind("fldCloseDate", "{0:dd/MM/yyyy}") %>'></asp:Label>
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Create a SelectedIndexChanged event for the dropdownlist2. Set the autopostback property to true. Inside the event, check whether the text in the list is yes or no and set the date accordingly. For example

if dropdownlist2.text="Yes" then
end if

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Visual Basic.NET

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