If you’re having problems adding an item to a dropdownlist because that ddl has a Datasource then this should work.
You need to set AppendDataBoundItems=”true” to add items to a datasource bound DropDownlist.
<asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="SqlDataSource1"DataTextField="Short_Name" DataValueField="Short_Name" Width="150px" AppendDataBoundItems="true" >
<asp:ListItem Value="" Selected="True">Select an item</asp:ListItem>
</asp:DropDownList>

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