'column1' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value
<td style="text-align: left"> <asp:DropDownList ID="column1" AutoPostBack="true" runat="server" Style="width: 250px" OnSelectedIndexChanged="column1_SelectedIndexChanged" OnDataBound="column1_DataBound"> </asp:DropDownList> </td>
var
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