Insert data into sql from web form

Question

 

 

<asp:DropDownList ID="ddltype" runat="server" CssClass="dropspace" Style="width: 95%; float: left">

<asp:ListItem >SELECT YOUR GADGE</asp:ListItem>
<asp:ListItem >Laptop</asp:ListItem>
<asp:ListItem >Desktop</asp:ListItem>
<asp:ListItem >Printer</asp:ListItem>

</asp:DropDownList>

 

 

 Everything works fine but the problem is that the list item SELECT YOUR GADGET  is also inserts into sql database if i dont select any gadget and click on submit button. Please help me out from this problem.

 

NOTE: THE BACKEND CODE IS WRITTEN IN C#.