When Select An Item, Other Get Automatically Selected

Oct 30, 2009

<asp:ListBox ID="ListBox1" runat="server" SelectionMode ="Multiple" >
<asp:ListItem Value="1">A</asp:ListItem>
<asp:ListItem Value="2">B</asp:ListItem>
<asp:ListItem Value="2">C</asp:ListItem>

I select item C,when i click on button,B is selected automatically.y??When i select items B and C,when i click on button,only B is selected???Y???

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